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4. Consolidating Pre-Service Physics Teachers' Subject Matter Knowledge Using Didactical Reconstructions

Author

Mäntylä, T. and Nousiainen, M.

Abstract

In the Department of Physics, University of Helsinki, there are advanced physics courses designed for the needs of pre-service physics teachers. The starting point is that after introductory and intermediate physics courses, pre-service physics teachers know laws and definitions but the knowledge is quite fragmented and does not form coherent wholes. Graphical tools called didactical reconstructions were developed to help pre-service physics teachers to consolidate their physics knowledge. The idea behind the reconstructions is that "new" physics knowledge is always constructed based on previous knowledge (quantities, laws, theory). This means that every new concept is connected to previous concepts when it is formed; this is captured in the didactical reconstruction of processes. Then, when the knowledge is further constructed, the formed concept will be connected to other new concepts. This approach leads to the didactical reconstruction of structure: networks of quantities and laws, where the experiments and models construct the connections between quantities and laws. Here an overview and summary of the educational approach based on the didactical reconstruction is given for the first time. The results of the previously reported case studies show that the didactical reconstructions help students to connect the knowledge pieces into meaningful and more coherent wholes. These didactical reconstructions are now an integral part of our pre-service physics teacher education.

Published
2014
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10. Factors Associated with Revision Surgery after Internal Fixation of Hip Fractures

Author

Sprague, S. (Sheila), Schemitsch, E.H. (Emil H.), Swiontkowski, M.F. (Marc ), Della Rocca, G.J. (Gregory J.), Jeray, K.J. (Kyle J.), Liew, S. (Susan), Slobogean, G.P. (Gerard P.), Bzovsky, S. (Sofia), Heels-Ansdell, D. (Diane), Zhou, Q. (Qi), Bhandari, M. (Mohit), Sprag, S. (Sheila), Devereaux, P.J., Guyatt, G.H. (Gordon), Heetveld, M.J. (Martin J.), Richardson, M. (Martin), Thabane, L. (Lehana), Tornetta III, P. (Paul), Walter, S.D. (Stephen D.), McKay, P. (Paula), Scott, T. (Taryn), Garibaldi, A. (Alisha), Viveiros, H. (Helena), Swinton, M. (Marilyn), Gichuru, M. (Mark), Buckingham, L. (Lisa), Duraikannan, A. (Aravin), Maddock, D. (Deborah), Simunovic, N. (Nicole), Agel, J. (Julie), Lieshout, E.M.M. (Esther) van, Zielinski, S.M. (Stephanie), Rangan, A. (Amar), Hanusch, B.C. (Birgit C.), Kottam, L. (Lucksy), Clarkson, R. (Rachel), Haverlag, R. (Robert), McCormack, R. (Robert), Apostle, K. (Kelly), Boyer, D. (Dory), Moola, F. (Farhad), Perey, B. (Bertrand), Stone, T. (Trevor), Viskontas, D. (Darius), Lemke, H.M. (H. Michael), Zomar, M. (Mauri), Moon, K. (Karyn), Moon, R. (Raely), Oatt, A. (Amber), Buckley, R.E. (Richard E.), Duffy, P. (Paul), Korley, R. (Robert), Puloski, S. (Shannon), Powell, J. (James), Johnston, K. (Kelly), Carcary, K. (Kimberly), Lorenzo, M. (Melissa), McKercher, R. (Ross), Sanders, D. (David), MacLeod, M. (Mark), Lawendy, A.-R. (Abdel-Rahman), Tieszer, C. (Christina), Stephen, D. (David), Kreder, H. (Hans), Jenkinson, R. (Richard), Nousiainen, M. (Markku), Axelrod, T. (Terry), Murnaghan, J. (John), Nam, D. (Diane), Wadey, V. (Veronica), Yee, A. (Albert), Milner, K. (Katrine), Kunz, M. (Monica), Ghent, W. (Wesley), McKee, M.D. (Michael D.), Hall, J.A. (Jeremy A.), Nauth, A. (Aaron), Ahn, H. (Henry), Whelan, D.B. (Daniel B.), Vicente, M.R. (Milena R.), Wild, L.M. (Lisa M.), Khan, R.M. (Ryan M.), Hidy, J.T. (Jennifer T.), Coles, C. (Chad), Leighton, R. (Ross), Biddulph, M. (Michael), Johnston, D. (David), Glazebrook, M. (Mark), Alexander, D. (David), Coady, C. (Catherine), Dunbar, M. (Michael), Amirault, J.D. (J. David), Gross, M. (Michael), Oxner, W. (William), Reardon, G. (Gerald), Richardson, C.G. (C. Glen), Trenholm, J.A. (J. Andrew), Wong, I. (Ivan), Trask, K. (Kelly), MacDonald, S. (Shelley), Dobbin, G. (Gwendolyn), Bicknell, R. (Ryan), Yach, J. (Jeff), Bardana, D. (Davide), Wood, G. (Gavin), Harrison, M. (Mark), Yen, D. (David), Lambert, S. (Sue), Howells, F. (Fiona), Ward, A. (Angela), Zalzal, P. (Paul), Brien, H. (Heather), Naumetz, V. (V.), Weening, B. (Brad), Wai, E.K. (Eugene K.), Papp, S. (Steve), Gofton, W.T. (Wade T.), Liew, A. (Allen), Kingwell, S.P. (Stephen P.), Johnson, G. (Garth), O'Neil, J. (Joseph), Roffey, D.M. (Darren M.), Borsella, V. (Vivian), Avram, V. (Victoria), Oliver, T.M. (Todd M.), Jones, V. (Vicki), Vogt, M. (Michelle), Jones, C.B. (Clifford B.), Ringler, J.R. (James R.), Endres, T.J. (Terrence J.), Sietsema, D.L. (Debra L.), Walker, J.E. (Jane E.), Broderick, J.S. (J. Scott), Goetz, D.R. (David R.), Pace, T.B. (Thomas B.), Schaller, T.M. (Thomas M.), Porter, S.E. (Scott E.), Beckish, M.L. (Michael L.), Adams, J.D. (John D.), Barden, B.B. (Benjamin B.), Creek, A.T. (Aaron T.), Finley, S.H. (Stephen H.), Foret, J.L. (Jonathan L.), Gudger, G.K. (Garland K.), Gurich, R.W. (Richard W.), Hill, A.D. (Austin D.), Hollenbeck, S.M. (Steven M.), Jackson, L.T. (Lyle T.), Kruse, K.K. (Kevin K.), Lackey, W.G. (Wesley G.), Langan, J.W. (Justin W.), Lee, J. (Julia), Leffler, L.C. (Lauren C.), Miller, T.J. (Timothy J.), Murphy, R.L. (R. Lee), O'Malley, L.K. (Lawrence K.), Peters, M.E. (Melissa E.), Price, D.M. (Dustin M.), Tanksley, J.A. (John A.), Torres, E.T. (Erick T.), Watson, D.J. (Dylan J.), Watson, S.T. (Scott T.), Tanner, S.L. (Stephanie L.), Snider, R.G. (Rebecca G.), Nastoff, L.A. (Lauren A.), Bielby, S.A. (Shea A.), Teasdall, R.J. (Robert J.), Switzer, J.A. (Julie A.), Cole, P.A. (Peter A.), Anderson, S.A. (Sarah A.), Lafferty, P.M. (Paul M.), Li, M. (Mengnai), Ly, T.V. (Thuan V.), Marston, S.B. (Scott B.), Foley, A.L. (Amy L.), Vang, S. (Sandy), Wright, D.M. (David M.), Marcantonio, A.J. (Andrew J.), Kain, M.S.H. (Michael S.H.), Iorio, R. (Richard), Specht, L.M. (Lawrence M.), Tilzey, J.F. (John F.), Lobo, M.J. (Margaret J.), Garfi, J.S. (John S.), Vallier, H.A. (Heather A.), Dolenc, A. (Andrea), Breslin, M. (Mary), Prayson, M.J. (Michael J.), Laughlin, R. (Richard), Rubino, L.J. (L. Joseph), May, J. (Jedediah), Rieser, G.R. (Geoffrey Ryan), Dulaney-Cripe, L. (Liz), Gayton, C. (Chris), Shaer, J. (James), Schrickel, T. (Tyson), Hileman, B. (Barbara), Gorczyca, J.T. (John T.), Gross, J.M. (Jonathan M.), Humphrey, C.A. (Catherine A.), Kates, S. (Stephen), Ketz, J.P. (John P.), Noble, K. (Krista), McIntyre, A.W. (Allison W.), Pecorella, K. (Kaili), Davis, C.A. (Craig A.), Weinerman, S. (Stuart), Weingarten, P. (Peter), Stull, P. (Philip), Lindenbaum, S. (Stephen), Hewitt, M. (Michael), Schwappach, J. (John), Baker, J.K. (Janell K.), Rutherford, T. (Tori), Newman, H. (Heike), Lieberman, S. (Shane), Finn, E. (Erin), Robbins, K. (Kristin), Hurley, M. (Meghan), Lyle, L. (Lindsey), Mitchell, K. (Khalis), Browner, K. (Kieran), Whatley, E. (Erica), Payton, K. (Krystal), Reeves, C. (Christina), Cannada, L.K. (Lisa K.), Karges, D.E. (David E.), Dawson, S.A. (Sarah A.), Mehta, S. (Samir), Esterhai, J. (John), Ahn, J. (Jaimo), Donegan, D. (Derek), Horan, A.D. (Annamarie D.), Hesketh, P.J. (Patrick J.), Bannister, E.R. (Evan R.), Keeve, J.P. (Jonathan P.), Anderson, C.G. (Christopher G.), McDonald, M.D. (Michael D.), Hoffman, J.M. (Jodi M.), Tarkin, I. (Ivan), Siska, P. (Peter), Gruen, G. (Gary), Evans, A. (Andrew), Farrell, D.J. (Dana J.), Irrgang, J. (James), Luther, A. (Arlene), Cross, W.W. (William W.), Cass, J.R. (Joseph R.), Sems, S.A. (Stephen A.), Torchia, M.E. (Michael E.), Scrabeck, T. (Tyson), Jenkins, M. (Mark), Dumais, J. (Jules), Romero, A.W. (Amanda W.), Sagebien, C.A. (Carlos A.), Butler, M.S. (Mark S.), Monica, J.T. (James T.), Seuffert, P. (Patricia), Hsu, J.R. (Joseph R.), Stinner, D. (Daniel), Ficke, J. (James), Charlton, M. (Michael), Napierala, M. (Matthew), Fan, M. (Mary), Tannoury, C. (Chadi), Carlisle, H. (Hope), Silva, H. (Heather), Archdeacon, M. (Michael), Finnan, R. (Ryan), Le, T. (Toan), Wyrick, J. (John), Hess, S. (Shelley), Brennan, M.L. (Michael L.), Probe, R. (Robert), Kile, E. (Evelyn), Mills, K. (Kelli), Clipper, L. (Lydia), Yu, M. (Michelle), Erwin, K. (Katie), Horwitz, D. (Daniel), Strohecker, K. (Kent), Swenson, T.K. (Teresa K.), Schmidt, A.H. (Andrew H.), Westberg, J.R. (Jerald R.), Aurang, K. (Kamran), Zohman, G. (Gary), Peterson, B. (Brett), Huff, R.B. (Roger B.), Baele, J. (Joseph), Weber, T. (Timothy), Edison, M. (Matt), McBeth, J.C. (Jessica Cooper), Shively, K. (Karl), Ertl, J.P. (Janos P.), Mullis, B. (Brian), Parr, J.A. (J. Andrew), Worman, R. (Ripley), Frizzell, V. (Valda), Moore, M.M. (Molly M.), DePaolo, C.J. (Charles J.), Alosky, R. (Rachel), Shell, L.E. (Leslie E.), Hampton, L. (Lynne), Shepard, S. (Stephanie), Nanney, T. (Tracy), Cuento, C. (Claudine), Cantu, R.V. (Robert V.), Henderson, E.R. (Eric R.), Eickhoff, L.S. (Linda S.), Hammerberg, E.M. (E. Mark), Stahel, P. (Philip), Hak, D. (David), Mauffrey, C. (Cyril), Henderson, C. (Corey), Gissel, H. (Hannah), Gibula, D. (Douglas), Zamorano, D.P. (David P.), Tynan, M.C. (Martin C.), Pourmand, D. (Deeba), Lawson, D. (Deanna), Crist, B.D. (Brett D.), Murtha, Y.M. (Yvonne M.), Anderson, L.K. (Linda K.), Linehan, C. (Colleen), Pilling, L. (Lindsey), Lewis, C.G. (Courtland G.), Caminiti, S. (Stephanie), Sullivan, R.J. (Raymond J.), Roper, E. (Elizabeth), Obremskey, W. (William), Kregor, P. (Philip), Richards, J.E. (Justin E.), Stringfellow, K. (Kenya), Dohm, M.P. (Michael P.), Zellar, A. (Abby), Segers, M.J.M. (Michiel), Zijl, J.A.C. (Jacco A.C.), Verhoeven, B. (Bart), Smits, A.B. (Anke B.), De Vries, J.P.P.M. (Jean Paul P.M.), Fioole, B. (Bram), Van Der Hoeven, H. (Henk), Theunissen, E.B.M. (Evert B.M.), De Vries Reilingh, T.S. (Tammo S.), Govaert, L. (Lonneke), Wittich, P. (Philippe), De Brauw, M. (Maurits), Wille, J.C. (Jan), Go, P.M.N.Y.M. (Peter M.N.Y.M.), Ritchie, E.D. (Ewan D.), Wessel, R.N. (Ronald N.), Hammacher, E.R. (Eric), Visser, G.A. (Gijs A.), Stockmann, H. (Heyn), Silvis, R. (Rob), Snellen, J.P. (Jaap P.), Rijbroek, B. (Bram), Scheepers, J.J. (Joris J.), Vermeulen, E.G.J. (Erik G.J.), Siroen, M.P.C. (Michiel P.C.), Vuylsteke, R. (Ronald), Brom, H.L.F., Rijna, H., Rijcke, P.A.R. (Piet), Koppert, C.L. (Cees L.), Buijk, S.E. (Steven E.), Groenendijk, R.P.R. (Richard), Dawson, I. (Imro), Tetteroo, G.W.M. (Geert), Bruijninckx, M.M.M. (Milko), Doornebosch, P. (Pascal), Graaf, E.J.R. (Eelco) de, Elst, M. (Maarten) van der, Pol, C. (Carmen) van der, Riet, M. (Martijne) van 't, Karsten, T.M. (Thomas), Vries, M.R. (Mark) de, Stassen, L.P.S. (Laurents P.S.), Schep, N.W.L. (Niels), Ben Schmidt, G. (G.), Hoffman, W.H. (W. H.), Poolman, R.W. (Rudolf), Simons, M.P., Heijden, F.H.W.M. (Frank) van der, Willems, W.J. (Jaap), De Meulemeester, F.R.A.J. (Frank R.A.J.), Hart, C.P. (Cor P.) van der, Turckan, K. (Kahn), Festen, S. (Sebastiaan), Nies, F. (Frank) de, Out, N.J.M. (Nico J.M.), Bosma, J. (Jan), Kampen, A. (A.) van, Biert, J. (Jan), Van Vugt, A.B. (Arie B.), Edwards, M.J.R. (Michael J.R.), Blokhuis, T.J. (Taco J.), Frölke, J.P.M. (Jan Paul), Geeraedts, L.M.G. (Leo M.G.), Gardeniers, J.W.M. (Jean W.M.), Tan, E.C.T.H. (Edward C.T.H.), Poelhekke, L.M.S.J., De Waal Malefijt, M.C. (Maarten C.), Schreurs, B. (Bart), Roukema, G.R. (Gert), Josaputra, H.A. (Hong A.), Keller, P. (Paul), De Rooij, P.D. (Peter D.), Kuiken, H. (Hans), Boxma, H. (Han), Cleffken, B.I. (Berry), Liem, R. (Ronald), Rhemrev, S. (Steven), Bosman, C.H.R. (Coks H.R.), De Mol Van Otterloo, A. (Alexander), Hoogendoorn, J. (Jochem), Vries, A.C. (Alexander) de, Meylaerts, S.A.G. (Sven), Verhofstad, M.H.J. (Michiel), Meijer, J. (Joost), Van Egmond, T. (Teun), Van Der Brand, I. (Igor), Patka, P. (Peter), Eversdijk, M.G. (Martin), Peters, R. (Rolf), Hartog, D. (Dennis) den, Waes, O.J.F. (Oscar) van, Oprel, P.P. (Pim), Vis, H.M. (Harm) van der, Campo, M. (Martin), Verhagen, R. (Ronald), Albers, G.H.R. (G.H. Robert), Zurcher, A.W. (Arthur W.), Simmermacher, R.K.J., Van Mulken, J. (Jeroen), Wessem, K.J.P. van, Van Gaalen, S.M. (Steven M.), Leenen, L.P.H., Bronkhorst, M.W.G.A. (Maarten), Guicherit, O.R. (Onno R.), Goslings, J.C. (Carel), Ponsen, K.J. (Kees-jan), Bhatia, M. (Mahesh), Arora, V. (Vinod), Tyagi, V. (Vivek), Bedi, H. (Harvinder), Carr, A. (Ashley), Curry, H. (Hamish), Chia, A. (Andrew), Csongvay, S. (Steve), Donohue, C. (Craig), Doig, S. (Stephen), Edwards, E. (Elton), Etherington, G. (Greg), Esser, M. (Max), Gong, A. (Andrew), Jain, A. (Arvind), Li, D. (Doug), Miller, R. (Russell), Moaveni, A. (Ash), Russ, M. (Matthias), Ton, L. (Lu), Wang, O. (Otis), Dowrick, A. (Adam), Murdoch, Z. (Zoe), Sage, C. (Claire), Frihagen, F. (Frede), Clarke-Jenssen, J. (John), Hjorthaug, G. (Geir), Ianssen, T. (Torben), Amundsen, A. (Asgeir), Brattgjerd, J.E. (Jan Egil), Borch, T. (Tor), Bøe, B. (Berthe), Flatøy, B. (Bernhard), Hasselund, S. (Sondre), Haug, K.J. (Knut Jørgen), Hemlock, K. (Kim), Hoseth, T.M. (Tor Magne), Jomaas, G. (Geir), Kibsgård, T. (Thomas), Lona, T. (Tarjei), Moatshe, G. (Gilbert), Müller, O. (Oliver), Molund, M. (Marius), Nicolaisen, T. (Tor), Nilsen, F. (Fredrik), Rydinge, J. (Jonas), Smedsrud, M. (Morten), Stødle, A. (Are), Trommer, A. (Axel), Ugland, S. (Stein), Karlsten, A. (Anders), Ekås, G. (Guri), Vesterhus, E.B. (Elise Berg), Brekke, A.C. (Anne Christine), Gupta, A. (Ajay), Jain, N. (Neeraj), Khan, F. (Farah), Sharma, A. (Ateet), Sanghavi, A. (Amir), Trivedi, M. (Mittal), Rai, A. (Anil), Subash, (), Rai, K. (Kamal), Yadav, V. (Vineet), Singh, S. (Sanjay), Tetsworth, K. (Kevin), Donald, G. (Geoff), Weinrauch, P. (Patrick), Pincus, P. (Paul), Yang, S. (Steven), Halliday, B. (Brett), Gervais, T. (Trevor), Holt, M. (Michael), Flynn, A. (Annette), Prasad, A.S. (Amal Shankar), Mishra, V. (Vimlesh), Sundaresh, D.C. (D. C.), Khanna, A. (Angshuman), Cherian, J.J. (Joe Joseph), Olakkengil, D.J. (Davy J), Sharma, G. (Gaurav), Pirpiris, M. (Marinis), Love, D. (David), Bucknill, A. (Andrew), Farrugia, R.J. (Richard J), Pape, H.-C. (Hans-Christoph), Knobe, M. (Matthias), Pfeifer, R. (Roman), Hull, P. (Peter), Lewis, S. (Sophie), Evans, S. (Simone), Nanda, R. (Rajesh), Logishetty, R. (Rajanikanth), Anand, S. (Sanjeev), Bowler, C. (Carol), Dadi, A. (Akhil), Palla, N. (Naveen), Ganguly, U. (Utsav), Rai, B.S. (B. Sachidananda), Rajakumar, J. (Janakiraman), Jennings, A. (Andrew), Chuter, G. (Graham), Rose, G. (Glynis), Horner, G. (Gillian), Clark, C. (Callum), Eke, K. (Kate), Reed, M.R. (Mike), Inman, D. (Dominic), Herriott, C. (Chris), Dobb, C. (Christine), Sprague, S. (Sheila), Schemitsch, E.H. (Emil H.), Swiontkowski, M.F. (Marc ), Della Rocca, G.J. (Gregory J.), Jeray, K.J. (Kyle J.), Liew, S. (Susan), Slobogean, G.P. (Gerard P.), Bzovsky, S. (Sofia), Heels-Ansdell, D. (Diane), Zhou, Q. (Qi), Bhandari, M. (Mohit), Sprag, S. (Sheila), Devereaux, P.J., Guyatt, G.H. (Gordon), Heetveld, M.J. (Martin J.), Richardson, M. (Martin), Thabane, L. (Lehana), Tornetta III, P. (Paul), Walter, S.D. (Stephen D.), McKay, P. (Paula), Scott, T. (Taryn), Garibaldi, A. (Alisha), Viveiros, H. (Helena), Swinton, M. (Marilyn), Gichuru, M. (Mark), Buckingham, L. (Lisa), Duraikannan, A. (Aravin), Maddock, D. (Deborah), Simunovic, N. (Nicole), Agel, J. (Julie), Lieshout, E.M.M. (Esther) van, Zielinski, S.M. (Stephanie), Rangan, A. (Amar), Hanusch, B.C. (Birgit C.), Kottam, L. (Lucksy), Clarkson, R. (Rachel), Haverlag, R. (Robert), McCormack, R. (Robert), Apostle, K. (Kelly), Boyer, D. (Dory), Moola, F. (Farhad), Perey, B. (Bertrand), Stone, T. (Trevor), Viskontas, D. (Darius), Lemke, H.M. (H. Michael), Zomar, M. (Mauri), Moon, K. (Karyn), Moon, R. (Raely), Oatt, A. (Amber), Buckley, R.E. (Richard E.), Duffy, P. (Paul), Korley, R. (Robert), Puloski, S. (Shannon), Powell, J. (James), Johnston, K. (Kelly), Carcary, K. (Kimberly), Lorenzo, M. (Melissa), McKercher, R. (Ross), Sanders, D. (David), MacLeod, M. (Mark), Lawendy, A.-R. (Abdel-Rahman), Tieszer, C. (Christina), Stephen, D. (David), Kreder, H. (Hans), Jenkinson, R. (Richard), Nousiainen, M. (Markku), Axelrod, T. (Terry), Murnaghan, J. (John), Nam, D. (Diane), Wadey, V. (Veronica), Yee, A. (Albert), Milner, K. (Katrine), Kunz, M. (Monica), Ghent, W. (Wesley), McKee, M.D. (Michael D.), Hall, J.A. (Jeremy A.), Nauth, A. (Aaron), Ahn, H. (Henry), Whelan, D.B. (Daniel B.), Vicente, M.R. (Milena R.), Wild, L.M. (Lisa M.), Khan, R.M. (Ryan M.), Hidy, J.T. (Jennifer T.), Coles, C. (Chad), Leighton, R. (Ross), Biddulph, M. (Michael), Johnston, D. (David), Glazebrook, M. (Mark), Alexander, D. (David), Coady, C. (Catherine), Dunbar, M. (Michael), Amirault, J.D. (J. David), Gross, M. (Michael), Oxner, W. (William), Reardon, G. (Gerald), Richardson, C.G. (C. Glen), Trenholm, J.A. (J. Andrew), Wong, I. (Ivan), Trask, K. (Kelly), MacDonald, S. (Shelley), Dobbin, G. (Gwendolyn), Bicknell, R. (Ryan), Yach, J. (Jeff), Bardana, D. (Davide), Wood, G. (Gavin), Harrison, M. (Mark), Yen, D. (David), Lambert, S. (Sue), Howells, F. (Fiona), Ward, A. (Angela), Zalzal, P. (Paul), Brien, H. (Heather), Naumetz, V. (V.), Weening, B. (Brad), Wai, E.K. (Eugene K.), Papp, S. (Steve), Gofton, W.T. (Wade T.), Liew, A. (Allen), Kingwell, S.P. (Stephen P.), Johnson, G. (Garth), O'Neil, J. (Joseph), Roffey, D.M. (Darren M.), Borsella, V. (Vivian), Avram, V. (Victoria), Oliver, T.M. (Todd M.), Jones, V. (Vicki), Vogt, M. (Michelle), Jones, C.B. (Clifford B.), Ringler, J.R. (James R.), Endres, T.J. (Terrence J.), Sietsema, D.L. (Debra L.), Walker, J.E. (Jane E.), Broderick, J.S. (J. Scott), Goetz, D.R. (David R.), Pace, T.B. (Thomas B.), Schaller, T.M. (Thomas M.), Porter, S.E. (Scott E.), Beckish, M.L. (Michael L.), Adams, J.D. (John D.), Barden, B.B. (Benjamin B.), Creek, A.T. (Aaron T.), Finley, S.H. (Stephen H.), Foret, J.L. (Jonathan L.), Gudger, G.K. (Garland K.), Gurich, R.W. (Richard W.), Hill, A.D. (Austin D.), Hollenbeck, S.M. (Steven M.), Jackson, L.T. (Lyle T.), Kruse, K.K. (Kevin K.), Lackey, W.G. (Wesley G.), Langan, J.W. (Justin W.), Lee, J. (Julia), Leffler, L.C. (Lauren C.), Miller, T.J. (Timothy J.), Murphy, R.L. (R. Lee), O'Malley, L.K. (Lawrence K.), Peters, M.E. (Melissa E.), Price, D.M. (Dustin M.), Tanksley, J.A. (John A.), Torres, E.T. (Erick T.), Watson, D.J. (Dylan J.), Watson, S.T. (Scott T.), Tanner, S.L. (Stephanie L.), Snider, R.G. (Rebecca G.), Nastoff, L.A. (Lauren A.), Bielby, S.A. (Shea A.), Teasdall, R.J. (Robert J.), Switzer, J.A. (Julie A.), Cole, P.A. (Peter A.), Anderson, S.A. (Sarah A.), Lafferty, P.M. (Paul M.), Li, M. (Mengnai), Ly, T.V. (Thuan V.), Marston, S.B. (Scott B.), Foley, A.L. (Amy L.), Vang, S. (Sandy), Wright, D.M. (David M.), Marcantonio, A.J. (Andrew J.), Kain, M.S.H. (Michael S.H.), Iorio, R. (Richard), Specht, L.M. (Lawrence M.), Tilzey, J.F. (John F.), Lobo, M.J. (Margaret J.), Garfi, J.S. (John S.), Vallier, H.A. (Heather A.), Dolenc, A. (Andrea), Breslin, M. (Mary), Prayson, M.J. (Michael J.), Laughlin, R. (Richard), Rubino, L.J. (L. Joseph), May, J. (Jedediah), Rieser, G.R. (Geoffrey Ryan), Dulaney-Cripe, L. (Liz), Gayton, C. (Chris), Shaer, J. (James), Schrickel, T. (Tyson), Hileman, B. (Barbara), Gorczyca, J.T. (John T.), Gross, J.M. (Jonathan M.), Humphrey, C.A. (Catherine A.), Kates, S. (Stephen), Ketz, J.P. (John P.), Noble, K. (Krista), McIntyre, A.W. (Allison W.), Pecorella, K. (Kaili), Davis, C.A. (Craig A.), Weinerman, S. (Stuart), Weingarten, P. (Peter), Stull, P. (Philip), Lindenbaum, S. (Stephen), Hewitt, M. (Michael), Schwappach, J. (John), Baker, J.K. (Janell K.), Rutherford, T. (Tori), Newman, H. (Heike), Lieberman, S. (Shane), Finn, E. (Erin), Robbins, K. (Kristin), Hurley, M. (Meghan), Lyle, L. (Lindsey), Mitchell, K. (Khalis), Browner, K. (Kieran), Whatley, E. (Erica), Payton, K. (Krystal), Reeves, C. (Christina), Cannada, L.K. (Lisa K.), Karges, D.E. (David E.), Dawson, S.A. (Sarah A.), Mehta, S. (Samir), Esterhai, J. (John), Ahn, J. (Jaimo), Donegan, D. (Derek), Horan, A.D. (Annamarie D.), Hesketh, P.J. (Patrick J.), Bannister, E.R. (Evan R.), Keeve, J.P. (Jonathan P.), Anderson, C.G. (Christopher G.), McDonald, M.D. (Michael D.), Hoffman, J.M. (Jodi M.), Tarkin, I. (Ivan), Siska, P. (Peter), Gruen, G. (Gary), Evans, A. (Andrew), Farrell, D.J. (Dana J.), Irrgang, J. (James), Luther, A. (Arlene), Cross, W.W. (William W.), Cass, J.R. (Joseph R.), Sems, S.A. (Stephen A.), Torchia, M.E. (Michael E.), Scrabeck, T. (Tyson), Jenkins, M. (Mark), Dumais, J. (Jules), Romero, A.W. (Amanda W.), Sagebien, C.A. (Carlos A.), Butler, M.S. (Mark S.), Monica, J.T. (James T.), Seuffert, P. (Patricia), Hsu, J.R. (Joseph R.), Stinner, D. (Daniel), Ficke, J. (James), Charlton, M. (Michael), Napierala, M. (Matthew), Fan, M. (Mary), Tannoury, C. (Chadi), Carlisle, H. (Hope), Silva, H. (Heather), Archdeacon, M. (Michael), Finnan, R. (Ryan), Le, T. (Toan), Wyrick, J. (John), Hess, S. (Shelley), Brennan, M.L. (Michael L.), Probe, R. (Robert), Kile, E. (Evelyn), Mills, K. (Kelli), Clipper, L. (Lydia), Yu, M. (Michelle), Erwin, K. (Katie), Horwitz, D. (Daniel), Strohecker, K. (Kent), Swenson, T.K. (Teresa K.), Schmidt, A.H. (Andrew H.), Westberg, J.R. (Jerald R.), Aurang, K. (Kamran), Zohman, G. (Gary), Peterson, B. (Brett), Huff, R.B. (Roger B.), Baele, J. (Joseph), Weber, T. (Timothy), Edison, M. (Matt), McBeth, J.C. (Jessica Cooper), Shively, K. (Karl), Ertl, J.P. (Janos P.), Mullis, B. (Brian), Parr, J.A. (J. Andrew), Worman, R. (Ripley), Frizzell, V. (Valda), Moore, M.M. (Molly M.), DePaolo, C.J. (Charles J.), Alosky, R. (Rachel), Shell, L.E. (Leslie E.), Hampton, L. (Lynne), Shepard, S. (Stephanie), Nanney, T. (Tracy), Cuento, C. (Claudine), Cantu, R.V. (Robert V.), Henderson, E.R. (Eric R.), Eickhoff, L.S. (Linda S.), Hammerberg, E.M. (E. Mark), Stahel, P. (Philip), Hak, D. (David), Mauffrey, C. (Cyril), Henderson, C. (Corey), Gissel, H. (Hannah), Gibula, D. (Douglas), Zamorano, D.P. (David P.), Tynan, M.C. (Martin C.), Pourmand, D. (Deeba), Lawson, D. (Deanna), Crist, B.D. (Brett D.), Murtha, Y.M. (Yvonne M.), Anderson, L.K. (Linda K.), Linehan, C. (Colleen), Pilling, L. (Lindsey), Lewis, C.G. (Courtland G.), Caminiti, S. (Stephanie), Sullivan, R.J. (Raymond J.), Roper, E. (Elizabeth), Obremskey, W. (William), Kregor, P. (Philip), Richards, J.E. (Justin E.), Stringfellow, K. (Kenya), Dohm, M.P. (Michael P.), Zellar, A. (Abby), Segers, M.J.M. (Michiel), Zijl, J.A.C. (Jacco A.C.), Verhoeven, B. (Bart), Smits, A.B. (Anke B.), De Vries, J.P.P.M. (Jean Paul P.M.), Fioole, B. (Bram), Van Der Hoeven, H. (Henk), Theunissen, E.B.M. (Evert B.M.), De Vries Reilingh, T.S. (Tammo S.), Govaert, L. (Lonneke), Wittich, P. (Philippe), De Brauw, M. (Maurits), Wille, J.C. (Jan), Go, P.M.N.Y.M. (Peter M.N.Y.M.), Ritchie, E.D. (Ewan D.), Wessel, R.N. (Ronald N.), Hammacher, E.R. (Eric), Visser, G.A. (Gijs A.), Stockmann, H. (Heyn), Silvis, R. (Rob), Snellen, J.P. (Jaap P.), Rijbroek, B. (Bram), Scheepers, J.J. (Joris J.), Vermeulen, E.G.J. (Erik G.J.), Siroen, M.P.C. (Michiel P.C.), Vuylsteke, R. (Ronald), Brom, H.L.F., Rijna, H., Rijcke, P.A.R. (Piet), Koppert, C.L. (Cees L.), Buijk, S.E. (Steven E.), Groenendijk, R.P.R. (Richard), Dawson, I. (Imro), Tetteroo, G.W.M. (Geert), Bruijninckx, M.M.M. (Milko), Doornebosch, P. (Pascal), Graaf, E.J.R. (Eelco) de, Elst, M. (Maarten) van der, Pol, C. (Carmen) van der, Riet, M. (Martijne) van 't, Karsten, T.M. (Thomas), Vries, M.R. (Mark) de, Stassen, L.P.S. (Laurents P.S.), Schep, N.W.L. (Niels), Ben Schmidt, G. (G.), Hoffman, W.H. (W. H.), Poolman, R.W. (Rudolf), Simons, M.P., Heijden, F.H.W.M. (Frank) van der, Willems, W.J. (Jaap), De Meulemeester, F.R.A.J. (Frank R.A.J.), Hart, C.P. (Cor P.) van der, Turckan, K. (Kahn), Festen, S. (Sebastiaan), Nies, F. (Frank) de, Out, N.J.M. (Nico J.M.), Bosma, J. (Jan), Kampen, A. (A.) van, Biert, J. (Jan), Van Vugt, A.B. (Arie B.), Edwards, M.J.R. (Michael J.R.), Blokhuis, T.J. (Taco J.), Frölke, J.P.M. (Jan Paul), Geeraedts, L.M.G. (Leo M.G.), Gardeniers, J.W.M. (Jean W.M.), Tan, E.C.T.H. (Edward C.T.H.), Poelhekke, L.M.S.J., De Waal Malefijt, M.C. (Maarten C.), Schreurs, B. (Bart), Roukema, G.R. (Gert), Josaputra, H.A. (Hong A.), Keller, P. (Paul), De Rooij, P.D. (Peter D.), Kuiken, H. (Hans), Boxma, H. (Han), Cleffken, B.I. (Berry), Liem, R. (Ronald), Rhemrev, S. (Steven), Bosman, C.H.R. (Coks H.R.), De Mol Van Otterloo, A. (Alexander), Hoogendoorn, J. (Jochem), Vries, A.C. (Alexander) de, Meylaerts, S.A.G. (Sven), Verhofstad, M.H.J. (Michiel), Meijer, J. (Joost), Van Egmond, T. (Teun), Van Der Brand, I. (Igor), Patka, P. (Peter), Eversdijk, M.G. (Martin), Peters, R. (Rolf), Hartog, D. (Dennis) den, Waes, O.J.F. (Oscar) van, Oprel, P.P. (Pim), Vis, H.M. (Harm) van der, Campo, M. (Martin), Verhagen, R. (Ronald), Albers, G.H.R. (G.H. Robert), Zurcher, A.W. (Arthur W.), Simmermacher, R.K.J., Van Mulken, J. (Jeroen), Wessem, K.J.P. van, Van Gaalen, S.M. (Steven M.), Leenen, L.P.H., Bronkhorst, M.W.G.A. (Maarten), Guicherit, O.R. (Onno R.), Goslings, J.C. (Carel), Ponsen, K.J. (Kees-jan), Bhatia, M. (Mahesh), Arora, V. (Vinod), Tyagi, V. (Vivek), Bedi, H. (Harvinder), Carr, A. (Ashley), Curry, H. (Hamish), Chia, A. (Andrew), Csongvay, S. (Steve), Donohue, C. (Craig), Doig, S. (Stephen), Edwards, E. (Elton), Etherington, G. (Greg), Esser, M. (Max), Gong, A. (Andrew), Jain, A. (Arvind), Li, D. (Doug), Miller, R. (Russell), Moaveni, A. (Ash), Russ, M. (Matthias), Ton, L. (Lu), Wang, O. (Otis), Dowrick, A. (Adam), Murdoch, Z. (Zoe), Sage, C. (Claire), Frihagen, F. (Frede), Clarke-Jenssen, J. (John), Hjorthaug, G. (Geir), Ianssen, T. (Torben), Amundsen, A. (Asgeir), Brattgjerd, J.E. (Jan Egil), Borch, T. (Tor), Bøe, B. (Berthe), Flatøy, B. (Bernhard), Hasselund, S. (Sondre), Haug, K.J. (Knut Jørgen), Hemlock, K. (Kim), Hoseth, T.M. (Tor Magne), Jomaas, G. (Geir), Kibsgård, T. (Thomas), Lona, T. (Tarjei), Moatshe, G. (Gilbert), Müller, O. (Oliver), Molund, M. (Marius), Nicolaisen, T. (Tor), Nilsen, F. (Fredrik), Rydinge, J. (Jonas), Smedsrud, M. (Morten), Stødle, A. (Are), Trommer, A. (Axel), Ugland, S. (Stein), Karlsten, A. (Anders), Ekås, G. (Guri), Vesterhus, E.B. (Elise Berg), Brekke, A.C. (Anne Christine), Gupta, A. (Ajay), Jain, N. (Neeraj), Khan, F. (Farah), Sharma, A. (Ateet), Sanghavi, A. (Amir), Trivedi, M. (Mittal), Rai, A. (Anil), Subash, (), Rai, K. (Kamal), Yadav, V. (Vineet), Singh, S. (Sanjay), Tetsworth, K. (Kevin), Donald, G. (Geoff), Weinrauch, P. (Patrick), Pincus, P. (Paul), Yang, S. (Steven), Halliday, B. (Brett), Gervais, T. (Trevor), Holt, M. (Michael), Flynn, A. (Annette), Prasad, A.S. (Amal Shankar), Mishra, V. (Vimlesh), Sundaresh, D.C. (D. C.), Khanna, A. (Angshuman), Cherian, J.J. (Joe Joseph), Olakkengil, D.J. (Davy J), Sharma, G. (Gaurav), Pirpiris, M. (Marinis), Love, D. (David), Bucknill, A. (Andrew), Farrugia, R.J. (Richard J), Pape, H.-C. (Hans-Christoph), Knobe, M. (Matthias), Pfeifer, R. (Roman), Hull, P. (Peter), Lewis, S. (Sophie), Evans, S. (Simone), Nanda, R. (Rajesh), Logishetty, R. (Rajanikanth), Anand, S. (Sanjeev), Bowler, C. (Carol), Dadi, A. (Akhil), Palla, N. (Naveen), Ganguly, U. (Utsav), Rai, B.S. (B. Sachidananda), Rajakumar, J. (Janakiraman), Jennings, A. (Andrew), Chuter, G. (Graham), Rose, G. (Glynis), Horner, G. (Gillian), Clark, C. (Callum), Eke, K. (Kate), Reed, M.R. (Mike), Inman, D. (Dominic), Herriott, C. (Chris), and Dobb, C. (Christine)

Abstract

Background: Femoral neck fractures are associated with high rates of revision surgery after management with internal fixation. Using data from the Fixation using Alternative Implants for the Treatment of Hip fractures (FAITH) trial evaluating methods of internal fixation in patients with femoral neck fractures, we investigated associations between baseline and surgical factors and the need for revision surgery to promote healing, relieve pain, treat infection or improve function over 24 months postsurgery. Additionally, we investigated factors associated with (1) hardware removal and (2) implant exchange from cancellous screws (CS) or sliding hip screw (SHS) to total hip arthroplasty, hemiarthroplasty, or another internal fixation device. Methods: We identified 15 potential factors a priori that may be associated with revision surgery, 7 with hardware removal, and 14 with implant exchange. We used multivariable Cox proportional hazards analyses in our investigation. Results: Factors associated with increased risk of revision surgery included: female sex, [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.25-2.50; P = 0.001], higher body mass index (for

Published
2018
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12. Fracture fixation in the operative management of hip fractures (FAITH): an international, multicentre, randomised controlled trial

Author

Nauth, A. (Aaron), Creek, A.T. (Aaron T.), Zellar, A. (Abby), Lawendy, A.-R. (Abdel-Rahman), Dowrick, A. (Adam), Gupta, A. (Ajay), Dadi, A. (Akhil), Kampen, A. (A.) van, Yee, A. (Albert), Vries, A.C. (Alexander) de, de Mol van Otterloo, A. (Alexander), Garibaldi, A. (Alisha), Liew, A. (Allen), McIntyre, A.W. (Allison W.), Prasad, A.S. (Amal Shankar), Romero, A.W. (Amanda W.), Rangan, A. (Amar), Oatt, A. (Amber), Sanghavi, A. (Amir), Foley, A.L. (Amy L.), Karlsten, A. (Anders), Dolenc, A. (Andrea), Bucknill, A. (Andrew), Chia, A. (Andrew), Evans, A. (Andrew), Gong, A. (Andrew), Schmidt, A.H. (Andrew H.), Marcantonio, A.J. (Andrew J.), Jennings, A. (Andrew), Ward, A. (Angela), Khanna, A. (Angshuman), Rai, A. (Anil), Smits, A.B. (Anke B.), Horan, A.D. (Annamarie D.), Brekke, A.C. (Anne Christine), Flynn, A. (Annette), Duraikannan, A. (Aravin), Stødle, A. (Are), van Vugt, A.B. (Arie B.), Luther, A. (Arlene), Zurcher, A.W. (Arthur W.), Jain, A. (Arvind), Amundsen, A. (Asgeir), Moaveni, A. (Ash), Carr, A. (Ashley), Sharma, A. (Ateet), Hill, A.D. (Austin D.), Trommer, A. (Axel), Rai, B.S. (B. Sachidananda), Hileman, B. (Barbara), Schreurs, B. (Bart), Verhoeven, B. (Bart), Barden, B.B. (Benjamin B.), Flatøy, B. (Bernhard), Cleffken, B.I. (Berry), Bøe, B. (Berthe), Perey, B. (Bertrand), Hanusch, B.C. (Birgit C.), Weening, B. (Brad), Fioole, B. (Bram), Rijbroek, B. (Bram), Crist, B.D. (Brett D.), Halliday, B. (Brett), Peterson, B. (Brett), Mullis, B. (Brian), Richardson, C.G. (C. Glen), Clark, C. (Callum), Sagebien, C.A. (Carlos A.), Pol, C. (Carmen) van der, Bowler, C. (Carol), Humphrey, C.A. (Catherine A.), Coady, C. (Catherine), Koppert, C.L. (Cees L.), Coles, C. (Chad), Tannoury, C. (Chadi), DePaolo, C.J. (Charles J.), Gayton, C. (Chris), Herriott, C. (Chris), Reeves, C. (Christina), Tieszer, C. (Christina), Dobb, C. (Christine), Anderson, C.G. (Christopher G.), Sage, C. (Claire), Cuento, C. (Claudine), Jones, C.B. (Clifford B.), Bosman, C.H.R. (Coks H.R.), Linehan, C. (Colleen), Hart, C.P. (Cor P.) van der, Henderson, C. (Corey), Lewis, C.G. (Courtland G.), Davis, C.A. (Craig A.), Donohue, C. (Craig), Mauffrey, C. (Cyril), Sundaresh, D.C. (D. C.), Farrell, D.J. (Dana J.), Whelan, D.B. (Daniel B.), Horwitz, D. (Daniel), Stinner, D. (Daniel), Viskontas, D. (Darius), Roffey, D.M. (Darren M.), Alexander, D. (David), Karges, D.E. (David E.), Hak, D. (David), Johnston, D. (David), Love, D. (David), Wright, D.M. (David M.), Zamorano, D.P. (David P.), Goetz, D.R. (David R.), Sanders, D. (David), Stephen, D. (David), Yen, D. (David), Bardana, D. (Davide), Olakkengil, D.J. (Davy J), Lawson, D. (Deanna), Maddock, D. (Deborah), Sietsema, D.L. (Debra L.), Pourmand, D. (Deeba), Hartog, D. (Dennis) den, Donegan, D. (Derek), Heels-Ansdell, D. (Diane), Nam, D. (Diane), Inman, D. (Dominic), Boyer, D. (Dory), Li, D. (Doug), Gibula, D. (Douglas), Price, D.M. (Dustin M.), Watson, D.J. (Dylan J.), Hammerberg, E.M. (E. Mark), Tan, E.T.C.H. (Edward T.C.H.), Graaf, E.J.R. (Eelco) de, Vesterhus, E.B. (Elise Berg), Roper, E. (Elizabeth), Edwards, E. (Elton), Schemitsch, E.H. (Emil), Hammacher, E.R. (Eric), Henderson, E.R. (Eric R.), Whatley, E. (Erica), Torres, E.T. (Erick T.), Vermeulen, E.G.J. (Erik G.J.), Finn, E. (Erin), Lieshout, E.M.M. (Esther) van, Wai, E.K. (Eugene K.), Bannister, E.R. (Evan R.), Kile, E. (Evelyn), Theunissen, E.B.M. (Evert B.M.), Ritchie, E.D. (Ewan D.), Khan, F. (Farah), Moola, F. (Farhad), Howells, F. (Fiona), Nies, F. (Frank) de, Heijden, F.H.W.M. (Frank) van der, de Meulemeester, F.R.A.J. (Frank R.A.J.), Frihagen, F. (Frede), Nilsen, F. (Fredrik), Schmidt, G.B. (G. Ben), Albers, G.H.R. (G.H. Robert), Gudger, G.K. (Garland K.), Johnson, G. (Garth), Gruen, G. (Gary), Zohman, G. (Gary), Sharma, G. (Gaurav), Wood, G. (Gavin), Tetteroo, G.W.M. (Geert), Hjorthaug, G. (Geir), Jomaas, G. (Geir), Donald, G. (Geoff), Rieser, G.R. (Geoffrey Ryan), Reardon, G. (Gerald), Slobogean, G.P. (Gerard P.), Roukema, G.R. (Gert), Visser, G.A. (Gijs A.), Moatshe, G. (Gilbert), Horner, G. (Gillian), Rose, G. (Glynis), Guyatt, G. (Gordon), Chuter, G. (Graham), Etherington, G. (Greg), Rocca, G.J.D. (Gregory J. Della), Ekås, G. (Guri), Dobbin, G. (Gwendolyn), Lemke, H.M. (H. Michael), Curry, H. (Hamish), Boxma, H. (Han), Gissel, H. (Hannah), Kreder, H. (Hans), Kuiken, H. (Hans), Brom, H.L.F., Pape, H.-C. (Hans-Christoph), Vis, H.M. (Harm) van der, Bedi, H. (Harvinder), Vallier, H.A. (Heather A.), Brien, H. (Heather), Silva, H. (Heather), Newman, H. (Heike), Viveiros, H. (Helena), van der Hoeven, H. (Henk), Ahn, H. (Henry), Johal, H. (Herman), Rijna, H., Stockmann, H. (Heyn), Josaputra, H.A. (Hong A.), Carlisle, H. (Hope), van der Brand, I. (Igor), Dawson, I. (Imro), Tarkin, I. (Ivan), Wong, I. (Ivan), Parr, J.A. (J. Andrew), Trenholm, J.A. (J. Andrew), Goslings, J.C. (Carel), Amirault, J.D. (J. David), Broderick, J.S. (J. Scott), Snellen, J.P. (Jaap P.), Zijl, J.A.C. (Jacco A.C.), Ahn, J. (Jaimo), Ficke, J. (James), Irrgang, J. (James), Powell, J. (James), Ringler, J.R. (James R.), Shaer, J. (James), Monica, J.T. (James T.), Biert, J. (Jan), Bosma, J. (Jan), Brattgjerd, J.E. (Jan Egil), Frölke, J.P.M. (Jan Paul), Wille, J.C. (Jan), Rajakumar, J. (Janakiraman), Walker, J.E. (Jane E.), Baker, J.K. (Janell K.), Ertl, J.P. (Janos P.), de Vries, J.P.P.M. (Jean Paul P.M.), Gardeniers, J.W.M. (Jean W.M.), May, J. (Jedediah), Yach, J. (Jeff), Hidy, J.T. (Jennifer T.), Westberg, J.R. (Jerald R.), Hall, J.A. (Jeremy A.), van Mulken, J. (Jeroen), McBeth, J.C. (Jessica Cooper), Hoogendoorn, J. (Jochem), Hoffman, J.M. (Jodi M.), Cherian, J.J. (Joe Joseph), Tanksley, J.A. (John A.), Clarke-Jenssen, J. (John), Adams, J.D. (John D.), Esterhai, J. (John), Tilzey, J.F. (John F.), Murnaghan, J. (John), Ketz, J.P. (John P.), Garfi, J.S. (John S.), Schwappach, J. (John), Gorczyca, J.T. (John T.), Wyrick, J. (John), Rydinge, J. (Jonas), Foret, J.L. (Jonathan L.), Gross, J.M. (Jonathan M.), Keeve, J.P. (Jonathan P.), Meijer, J. (Joost), Scheepers, J.J. (Joris J.), Baele, J. (Joseph), O'Neil, J. (Joseph), Cass, J.R. (Joseph R.), Hsu, J.R. (Joseph R.), Dumais, J. (Jules), Lee, J. (Julia), Switzer, J.A. (Julie A.), Agel, J. (Julie), Richards, J.E. (Justin E.), Langan, J.W. (Justin W.), Turckan, K. (Kahn), Pecorella, K. (Kaili), Rai, K. (Kamal), Aurang, K. (Kamran), Shively, K. (Karl), Wessem, K.J.P. van, Moon, K. (Karyn), Eke, K. (Kate), Erwin, K. (Katie), Milner, K. (Katrine), Ponsen, K.J. (Kees-jan), Mills, K. (Kelli), Apostle, K. (Kelly), Johnston, K. (Kelly), Trask, K. (Kelly), Strohecker, K. (Kent), Stringfellow, K. (Kenya), Kruse, K.K. (Kevin K.), Tetsworth, K. (Kevin), Mitchell, K. (Khalis), Browner, K. (Kieran), Hemlock, K. (Kim), Carcary, K. (Kimberly), Jørgen Haug, K. (Knut), Noble, K. (Krista), Robbins, K. (Kristin), Payton, K. (Krystal), Jeray, K.J. (Kyle J.), Rubino, L.J. (L. Joseph), Nastoff, L.A. (Lauren A.), Leffler, L.C. (Lauren C.), Stassen, L.P. (Laurents), O'Malley, L.K. (Lawrence K.), Specht, L.M. (Lawrence M.), Thabane, L. (Lehana), Geeraedts, L.M.G. (Leo M.G.), Shell, L.E. (Leslie E.), Anderson, L.K. (Linda K.), Eickhoff, L.S. (Linda S.), Lyle, L. (Lindsey), Pilling, L. (Lindsey), Buckingham, L. (Lisa), Cannada, L.K. (Lisa K.), Wild, L.M. (Lisa M.), Dulaney-Cripe, L. (Liz), Poelhekke, L.M.S.J., Govaert, L. (Lonneke), Ton, L. (Lu), Kottam, L. (Lucksy), Leenen, L.P.H. (Luke), Clipper, L. (Lydia), Jackson, L.T. (Lyle T.), Hampton, L. (Lynne), de Waal Malefijt, M.C. (Maarten C.), Simons, M.P., Elst, M. (Maarten) van der, Bronkhorst, M.W.G.A. (Maarten), Bhatia, M. (Mahesh), Swiontkowski, M.F. (Marc ), Lobo, M.J. (Margaret J.), Swinton, M. (Marilyn), Pirpiris, M. (Marinis), Molund, M. (Marius), Gichuru, M. (Mark), Glazebrook, M. (Mark), Harrison, M. (Mark), Jenkins, M. (Mark), MacLeod, M. (Mark), Vries, M.R. (Mark) de, Butler, M.S. (Mark S.), Nousiainen, M. (Markku), van ‘t Riet, M. (Martijne), Tynan, M.C. (Martin C.), Campo, M. (Martin), Eversdijk, M.G. (Martin), Heetveld, M.J. (Martin), Richardson, M. (Martin), Breslin, M. (Mary), Fan, M. (Mary), Edison, M. (Matt), Napierala, M. (Matthew), Knobe, M. (Matthias), Russ, M. (Matthias), Zomar, M. (Mauri), de Brauw, M. (Maurits), Esser, M. (Max), Hurley, M. (Meghan), Peters, M.E. (Melissa E.), Lorenzo, M. (Melissa), Li, M. (Mengnai), Archdeacon, M. (Michael), Biddulph, M. (Michael), Charlton, M. (Michael), McDonald, M.D. (Michael D.), McKee, M.D. (Michael D.), Dunbar, M. (Michael), Torchia, M.E. (Michael E.), Gross, M. (Michael), Hewitt, M. (Michael), Holt, M. (Michael), Prayson, M.J. (Michael J.), Edwards, M.J.R. (Michael), Beckish, M.L. (Michael L.), Brennan, M.L. (Michael L.), Dohm, M.P. (Michael P.), Kain, M.S.H. (Michael S.H.), Vogt, M. (Michelle), Yu, M. (Michelle), Verhofstad, M.H.J. (Michiel), Segers, M.J.M. (Michiel J.M.), Segers, M.J.M. (Michiel), Siroen, M.P.C. (Michiel P.C.), Reed, M.R. (Mike), Vicente, M.R. (Milena R.), Bruijninckx, M.M.M. (Milko), Trivedi, M. (Mittal), Bhandari, M. (Mohit), Moore, M.M. (Molly M.), Kunz, M. (Monica), Smedsrud, M. (Morten), Palla, N. (Naveen), Jain, N. (Neeraj), Out, N.J.M. (Nico J.M.), Simunovic, N. (Nicole), Schep, N.W.L. (Niels), Müller, O. (Oliver), Guicherit, O.R. (Onno R.), Waes, O.J.F. (Oscar) van, Wang, O. (Otis), Doornebosch, P. (Pascal), Seuffert, P. (Patricia), Hesketh, P.J. (Patrick J.), Weinrauch, P. (Patrick), Duffy, P. (Paul), Keller, P. (Paul), Lafferty, P.M. (Paul M.), Pincus, P. (Paul), Tornetta III, P. (Paul), Zalzal, P. (Paul), McKay, P. (Paula), Cole, P.A. (Peter A.), de Rooij, P.D. (Peter D.), Hull, P. (Peter), Go, P.M.N.Y.M. (Peter M.N.Y.M.), Patka, P. (Peter), Siska, P. (Peter), Weingarten, P. (Peter), Kregor, P. (Philip), Stahel, P. (Philip), Stull, P. (Philip), Wittich, P. (Philippe), Rijcke, P.A.R. (Piet), Oprel, P.P. (Pim), Devereaux, P.J. (P. J.), Zhou, Q. (Qi), Lee Murphy, R. (R.), Alosky, R. (Rachel), Clarkson, R. (Rachel), Moon, R. (Raely), Logishetty, R. (Rajanikanth), Nanda, R. (Rajesh), Sullivan, R.J. (Raymond J.), Snider, R.G. (Rebecca G.), Buckley, R.E. (Richard E.), Iorio, R. (Richard), Farrugia, R.J. (Richard J), Jenkinson, R. (Richard), Laughlin, R. (Richard), Groenendijk, R.P.R. (Richard), Gurich, R.W. (Richard W.), Worman, R. (Ripley), Silvis, R. (Rob), Haverlag, R. (Robert), Teasdall, R.J. (Robert J.), Korley, R. (Robert), McCormack, R. (Robert), Probe, R. (Robert), Cantu, R.V. (Robert V.), Huff, R.B. (Roger B.), Simmermacher, R.K.J., Peters, R. (Rolf), Pfeifer, R. (Roman), Liem, R. (Ronald), Wessel, R.N. (Ronald N.), Verhagen, R. (Ronald), Vuylsteke, R. (Ronald), Leighton, R. (Ross), McKercher, R. (Ross), Poolman, R.W. (Rudolf), Miller, R. (Russell), Bicknell, R. (Ryan), Finnan, R. (Ryan), Khan, R.M. (Ryan M.), Mehta, S. (Samir), Vang, S. (Sandy), Singh, S. (Sanjay), Anand, S. (Sanjeev), Anderson, S.A. (Sarah A.), Dawson, S.A. (Sarah A.), Marston, S.B. (Scott B.), Porter, S.E. (Scott E.), Watson, S.T. (Scott T.), Festen, S. (Sebastiaan), Lieberman, S. (Shane), Puloski, S. (Shannon), Bielby, S.A. (Shea A.), Sprague, S. (Sheila), Hess, S. (Shelley), MacDonald, S. (Shelley), Evans, S. (Simone), Bzovsky, S. (Sofia), Hasselund, S. (Sondre), Lewis, S. (Sophie), Ugland, S. (Stein), Caminiti, S. (Stephanie), Tanner, S.L. (Stephanie L.), Zielinski, S.M. (Stephanie), Shepard, S. (Stephanie), Sems, S.A. (Stephen A.), Walter, S.D. (Stephen D.), Doig, S. (Stephen), Finley, S.H. (Stephen H.), Kates, S. (Stephen), Lindenbaum, S. (Stephen), Kingwell, S.P. (Stephen P.), Csongvay, S. (Steve), Papp, S. (Steve), Buijk, S.E. (Steven E.), Rhemrev, S. (Steven), Hollenbeck, S.M. (Steven M.), van Gaalen, S.M. (Steven M.), Yang, S. (Steven), Weinerman, S. (Stuart), Subash, (), Lambert, S. (Sue), Liew, S. (Susan), Meylaerts, S.A.G. (Sven), Blokhuis, T.J. (Taco J.), de Vries Reilingh, T.S. (Tammo S.), Lona, T. (Tarjei), Scott, T. (Taryn), Swenson, T.K. (Teresa K.), Endres, T.J. (Terrence J.), Axelrod, T. (Terry), van Egmond, T. (Teun), Pace, T.B. (Thomas B.), Kibsgård, T. (Thomas), Schaller, T.M. (Thomas M.), Ly, T.V. (Thuan V.), Miller, T.J. (Timothy J.), Weber, T. (Timothy), Le, T. (Toan), Oliver, T.M. (Todd M.), Karsten, T.M. (Thomas), Borch, T. (Tor), Hoseth, T.M. (Tor Magne), Nicolaisen, T. (Tor), Ianssen, T. (Torben), Rutherford, T. (Tori), Nanney, T. (Tracy), Gervais, T. (Trevor), Stone, T. (Trevor), Schrickel, T. (Tyson), Scrabeck, T. (Tyson), Ganguly, U. (Utsav), Naumetz, V. (V.), Frizzell, V. (Valda), Wadey, V. (Veronica), Jones, V. (Vicki), Avram, V. (Victoria), Mishra, V. (Vimlesh), Yadav, V. (Vineet), Arora, V. (Vinod), Tyagi, V. (Vivek), Borsella, V. (Vivian), Willems, W.J. (Jaap), Hoffman, W.H. (W. H.), Gofton, W.T. (Wade T.), Lackey, W.G. (Wesley G.), Ghent, W. (Wesley), Obremskey, W. (William), Oxner, W. (William), Cross, W.W. (William W.), Murtha, Y.M. (Yvonne M.), Murdoch, Z. (Zoe), Nauth, A. (Aaron), Creek, A.T. (Aaron T.), Zellar, A. (Abby), Lawendy, A.-R. (Abdel-Rahman), Dowrick, A. (Adam), Gupta, A. (Ajay), Dadi, A. (Akhil), Kampen, A. (A.) van, Yee, A. (Albert), Vries, A.C. (Alexander) de, de Mol van Otterloo, A. (Alexander), Garibaldi, A. (Alisha), Liew, A. (Allen), McIntyre, A.W. (Allison W.), Prasad, A.S. (Amal Shankar), Romero, A.W. (Amanda W.), Rangan, A. (Amar), Oatt, A. (Amber), Sanghavi, A. (Amir), Foley, A.L. (Amy L.), Karlsten, A. (Anders), Dolenc, A. (Andrea), Bucknill, A. (Andrew), Chia, A. (Andrew), Evans, A. (Andrew), Gong, A. (Andrew), Schmidt, A.H. (Andrew H.), Marcantonio, A.J. (Andrew J.), Jennings, A. (Andrew), Ward, A. (Angela), Khanna, A. (Angshuman), Rai, A. (Anil), Smits, A.B. (Anke B.), Horan, A.D. (Annamarie D.), Brekke, A.C. (Anne Christine), Flynn, A. (Annette), Duraikannan, A. (Aravin), Stødle, A. (Are), van Vugt, A.B. (Arie B.), Luther, A. (Arlene), Zurcher, A.W. (Arthur W.), Jain, A. (Arvind), Amundsen, A. (Asgeir), Moaveni, A. (Ash), Carr, A. (Ashley), Sharma, A. (Ateet), Hill, A.D. (Austin D.), Trommer, A. (Axel), Rai, B.S. (B. Sachidananda), Hileman, B. (Barbara), Schreurs, B. (Bart), Verhoeven, B. (Bart), Barden, B.B. (Benjamin B.), Flatøy, B. (Bernhard), Cleffken, B.I. (Berry), Bøe, B. (Berthe), Perey, B. (Bertrand), Hanusch, B.C. (Birgit C.), Weening, B. (Brad), Fioole, B. (Bram), Rijbroek, B. (Bram), Crist, B.D. (Brett D.), Halliday, B. (Brett), Peterson, B. (Brett), Mullis, B. (Brian), Richardson, C.G. (C. Glen), Clark, C. (Callum), Sagebien, C.A. (Carlos A.), Pol, C. (Carmen) van der, Bowler, C. (Carol), Humphrey, C.A. (Catherine A.), Coady, C. (Catherine), Koppert, C.L. (Cees L.), Coles, C. (Chad), Tannoury, C. (Chadi), DePaolo, C.J. (Charles J.), Gayton, C. (Chris), Herriott, C. (Chris), Reeves, C. (Christina), Tieszer, C. (Christina), Dobb, C. (Christine), Anderson, C.G. (Christopher G.), Sage, C. (Claire), Cuento, C. (Claudine), Jones, C.B. (Clifford B.), Bosman, C.H.R. (Coks H.R.), Linehan, C. (Colleen), Hart, C.P. (Cor P.) van der, Henderson, C. (Corey), Lewis, C.G. (Courtland G.), Davis, C.A. (Craig A.), Donohue, C. (Craig), Mauffrey, C. (Cyril), Sundaresh, D.C. (D. C.), Farrell, D.J. (Dana J.), Whelan, D.B. (Daniel B.), Horwitz, D. (Daniel), Stinner, D. (Daniel), Viskontas, D. (Darius), Roffey, D.M. (Darren M.), Alexander, D. (David), Karges, D.E. (David E.), Hak, D. (David), Johnston, D. (David), Love, D. (David), Wright, D.M. (David M.), Zamorano, D.P. (David P.), Goetz, D.R. (David R.), Sanders, D. (David), Stephen, D. (David), Yen, D. (David), Bardana, D. (Davide), Olakkengil, D.J. (Davy J), Lawson, D. (Deanna), Maddock, D. (Deborah), Sietsema, D.L. (Debra L.), Pourmand, D. (Deeba), Hartog, D. (Dennis) den, Donegan, D. (Derek), Heels-Ansdell, D. (Diane), Nam, D. (Diane), Inman, D. (Dominic), Boyer, D. (Dory), Li, D. (Doug), Gibula, D. (Douglas), Price, D.M. (Dustin M.), Watson, D.J. (Dylan J.), Hammerberg, E.M. (E. Mark), Tan, E.T.C.H. (Edward T.C.H.), Graaf, E.J.R. (Eelco) de, Vesterhus, E.B. (Elise Berg), Roper, E. (Elizabeth), Edwards, E. (Elton), Schemitsch, E.H. (Emil), Hammacher, E.R. (Eric), Henderson, E.R. (Eric R.), Whatley, E. (Erica), Torres, E.T. (Erick T.), Vermeulen, E.G.J. (Erik G.J.), Finn, E. (Erin), Lieshout, E.M.M. (Esther) van, Wai, E.K. (Eugene K.), Bannister, E.R. (Evan R.), Kile, E. (Evelyn), Theunissen, E.B.M. (Evert B.M.), Ritchie, E.D. (Ewan D.), Khan, F. (Farah), Moola, F. (Farhad), Howells, F. (Fiona), Nies, F. (Frank) de, Heijden, F.H.W.M. (Frank) van der, de Meulemeester, F.R.A.J. (Frank R.A.J.), Frihagen, F. (Frede), Nilsen, F. (Fredrik), Schmidt, G.B. (G. Ben), Albers, G.H.R. (G.H. Robert), Gudger, G.K. (Garland K.), Johnson, G. (Garth), Gruen, G. (Gary), Zohman, G. (Gary), Sharma, G. (Gaurav), Wood, G. (Gavin), Tetteroo, G.W.M. (Geert), Hjorthaug, G. (Geir), Jomaas, G. (Geir), Donald, G. (Geoff), Rieser, G.R. (Geoffrey Ryan), Reardon, G. (Gerald), Slobogean, G.P. (Gerard P.), Roukema, G.R. (Gert), Visser, G.A. (Gijs A.), Moatshe, G. (Gilbert), Horner, G. (Gillian), Rose, G. (Glynis), Guyatt, G. (Gordon), Chuter, G. (Graham), Etherington, G. (Greg), Rocca, G.J.D. (Gregory J. Della), Ekås, G. (Guri), Dobbin, G. (Gwendolyn), Lemke, H.M. (H. Michael), Curry, H. (Hamish), Boxma, H. (Han), Gissel, H. (Hannah), Kreder, H. (Hans), Kuiken, H. (Hans), Brom, H.L.F., Pape, H.-C. (Hans-Christoph), Vis, H.M. (Harm) van der, Bedi, H. (Harvinder), Vallier, H.A. (Heather A.), Brien, H. (Heather), Silva, H. (Heather), Newman, H. (Heike), Viveiros, H. (Helena), van der Hoeven, H. (Henk), Ahn, H. (Henry), Johal, H. (Herman), Rijna, H., Stockmann, H. (Heyn), Josaputra, H.A. (Hong A.), Carlisle, H. (Hope), van der Brand, I. (Igor), Dawson, I. (Imro), Tarkin, I. (Ivan), Wong, I. (Ivan), Parr, J.A. (J. Andrew), Trenholm, J.A. (J. Andrew), Goslings, J.C. (Carel), Amirault, J.D. (J. David), Broderick, J.S. (J. Scott), Snellen, J.P. (Jaap P.), Zijl, J.A.C. (Jacco A.C.), Ahn, J. (Jaimo), Ficke, J. (James), Irrgang, J. (James), Powell, J. (James), Ringler, J.R. (James R.), Shaer, J. (James), Monica, J.T. (James T.), Biert, J. (Jan), Bosma, J. (Jan), Brattgjerd, J.E. (Jan Egil), Frölke, J.P.M. (Jan Paul), Wille, J.C. (Jan), Rajakumar, J. (Janakiraman), Walker, J.E. (Jane E.), Baker, J.K. (Janell K.), Ertl, J.P. (Janos P.), de Vries, J.P.P.M. (Jean Paul P.M.), Gardeniers, J.W.M. (Jean W.M.), May, J. (Jedediah), Yach, J. (Jeff), Hidy, J.T. (Jennifer T.), Westberg, J.R. (Jerald R.), Hall, J.A. (Jeremy A.), van Mulken, J. (Jeroen), McBeth, J.C. (Jessica Cooper), Hoogendoorn, J. (Jochem), Hoffman, J.M. (Jodi M.), Cherian, J.J. (Joe Joseph), Tanksley, J.A. (John A.), Clarke-Jenssen, J. (John), Adams, J.D. (John D.), Esterhai, J. (John), Tilzey, J.F. (John F.), Murnaghan, J. (John), Ketz, J.P. (John P.), Garfi, J.S. (John S.), Schwappach, J. (John), Gorczyca, J.T. (John T.), Wyrick, J. (John), Rydinge, J. (Jonas), Foret, J.L. (Jonathan L.), Gross, J.M. (Jonathan M.), Keeve, J.P. (Jonathan P.), Meijer, J. (Joost), Scheepers, J.J. (Joris J.), Baele, J. (Joseph), O'Neil, J. (Joseph), Cass, J.R. (Joseph R.), Hsu, J.R. (Joseph R.), Dumais, J. (Jules), Lee, J. (Julia), Switzer, J.A. (Julie A.), Agel, J. (Julie), Richards, J.E. (Justin E.), Langan, J.W. (Justin W.), Turckan, K. (Kahn), Pecorella, K. (Kaili), Rai, K. (Kamal), Aurang, K. (Kamran), Shively, K. (Karl), Wessem, K.J.P. van, Moon, K. (Karyn), Eke, K. (Kate), Erwin, K. (Katie), Milner, K. (Katrine), Ponsen, K.J. (Kees-jan), Mills, K. (Kelli), Apostle, K. (Kelly), Johnston, K. (Kelly), Trask, K. (Kelly), Strohecker, K. (Kent), Stringfellow, K. (Kenya), Kruse, K.K. (Kevin K.), Tetsworth, K. (Kevin), Mitchell, K. (Khalis), Browner, K. (Kieran), Hemlock, K. (Kim), Carcary, K. (Kimberly), Jørgen Haug, K. (Knut), Noble, K. (Krista), Robbins, K. (Kristin), Payton, K. (Krystal), Jeray, K.J. (Kyle J.), Rubino, L.J. (L. Joseph), Nastoff, L.A. (Lauren A.), Leffler, L.C. (Lauren C.), Stassen, L.P. (Laurents), O'Malley, L.K. (Lawrence K.), Specht, L.M. (Lawrence M.), Thabane, L. (Lehana), Geeraedts, L.M.G. (Leo M.G.), Shell, L.E. (Leslie E.), Anderson, L.K. (Linda K.), Eickhoff, L.S. (Linda S.), Lyle, L. (Lindsey), Pilling, L. (Lindsey), Buckingham, L. (Lisa), Cannada, L.K. (Lisa K.), Wild, L.M. (Lisa M.), Dulaney-Cripe, L. (Liz), Poelhekke, L.M.S.J., Govaert, L. (Lonneke), Ton, L. (Lu), Kottam, L. (Lucksy), Leenen, L.P.H. (Luke), Clipper, L. (Lydia), Jackson, L.T. (Lyle T.), Hampton, L. (Lynne), de Waal Malefijt, M.C. (Maarten C.), Simons, M.P., Elst, M. (Maarten) van der, Bronkhorst, M.W.G.A. (Maarten), Bhatia, M. (Mahesh), Swiontkowski, M.F. (Marc ), Lobo, M.J. (Margaret J.), Swinton, M. (Marilyn), Pirpiris, M. (Marinis), Molund, M. (Marius), Gichuru, M. (Mark), Glazebrook, M. (Mark), Harrison, M. (Mark), Jenkins, M. (Mark), MacLeod, M. (Mark), Vries, M.R. (Mark) de, Butler, M.S. (Mark S.), Nousiainen, M. (Markku), van ‘t Riet, M. (Martijne), Tynan, M.C. (Martin C.), Campo, M. (Martin), Eversdijk, M.G. (Martin), Heetveld, M.J. (Martin), Richardson, M. (Martin), Breslin, M. (Mary), Fan, M. (Mary), Edison, M. (Matt), Napierala, M. (Matthew), Knobe, M. (Matthias), Russ, M. (Matthias), Zomar, M. (Mauri), de Brauw, M. (Maurits), Esser, M. (Max), Hurley, M. (Meghan), Peters, M.E. (Melissa E.), Lorenzo, M. (Melissa), Li, M. (Mengnai), Archdeacon, M. (Michael), Biddulph, M. (Michael), Charlton, M. (Michael), McDonald, M.D. (Michael D.), McKee, M.D. (Michael D.), Dunbar, M. (Michael), Torchia, M.E. (Michael E.), Gross, M. (Michael), Hewitt, M. (Michael), Holt, M. (Michael), Prayson, M.J. (Michael J.), Edwards, M.J.R. (Michael), Beckish, M.L. (Michael L.), Brennan, M.L. (Michael L.), Dohm, M.P. (Michael P.), Kain, M.S.H. (Michael S.H.), Vogt, M. (Michelle), Yu, M. (Michelle), Verhofstad, M.H.J. (Michiel), Segers, M.J.M. (Michiel J.M.), Segers, M.J.M. (Michiel), Siroen, M.P.C. (Michiel P.C.), Reed, M.R. (Mike), Vicente, M.R. (Milena R.), Bruijninckx, M.M.M. (Milko), Trivedi, M. (Mittal), Bhandari, M. (Mohit), Moore, M.M. (Molly M.), Kunz, M. (Monica), Smedsrud, M. (Morten), Palla, N. (Naveen), Jain, N. (Neeraj), Out, N.J.M. (Nico J.M.), Simunovic, N. (Nicole), Schep, N.W.L. (Niels), Müller, O. (Oliver), Guicherit, O.R. (Onno R.), Waes, O.J.F. (Oscar) van, Wang, O. (Otis), Doornebosch, P. (Pascal), Seuffert, P. (Patricia), Hesketh, P.J. (Patrick J.), Weinrauch, P. (Patrick), Duffy, P. (Paul), Keller, P. (Paul), Lafferty, P.M. (Paul M.), Pincus, P. (Paul), Tornetta III, P. (Paul), Zalzal, P. (Paul), McKay, P. (Paula), Cole, P.A. (Peter A.), de Rooij, P.D. (Peter D.), Hull, P. (Peter), Go, P.M.N.Y.M. (Peter M.N.Y.M.), Patka, P. (Peter), Siska, P. (Peter), Weingarten, P. (Peter), Kregor, P. (Philip), Stahel, P. (Philip), Stull, P. (Philip), Wittich, P. (Philippe), Rijcke, P.A.R. (Piet), Oprel, P.P. (Pim), Devereaux, P.J. (P. J.), Zhou, Q. (Qi), Lee Murphy, R. (R.), Alosky, R. (Rachel), Clarkson, R. (Rachel), Moon, R. (Raely), Logishetty, R. (Rajanikanth), Nanda, R. (Rajesh), Sullivan, R.J. (Raymond J.), Snider, R.G. (Rebecca G.), Buckley, R.E. (Richard E.), Iorio, R. (Richard), Farrugia, R.J. (Richard J), Jenkinson, R. (Richard), Laughlin, R. (Richard), Groenendijk, R.P.R. (Richard), Gurich, R.W. (Richard W.), Worman, R. (Ripley), Silvis, R. (Rob), Haverlag, R. (Robert), Teasdall, R.J. (Robert J.), Korley, R. (Robert), McCormack, R. (Robert), Probe, R. (Robert), Cantu, R.V. (Robert V.), Huff, R.B. (Roger B.), Simmermacher, R.K.J., Peters, R. (Rolf), Pfeifer, R. (Roman), Liem, R. (Ronald), Wessel, R.N. (Ronald N.), Verhagen, R. (Ronald), Vuylsteke, R. (Ronald), Leighton, R. (Ross), McKercher, R. (Ross), Poolman, R.W. (Rudolf), Miller, R. (Russell), Bicknell, R. (Ryan), Finnan, R. (Ryan), Khan, R.M. (Ryan M.), Mehta, S. (Samir), Vang, S. (Sandy), Singh, S. (Sanjay), Anand, S. (Sanjeev), Anderson, S.A. (Sarah A.), Dawson, S.A. (Sarah A.), Marston, S.B. (Scott B.), Porter, S.E. (Scott E.), Watson, S.T. (Scott T.), Festen, S. (Sebastiaan), Lieberman, S. (Shane), Puloski, S. (Shannon), Bielby, S.A. (Shea A.), Sprague, S. (Sheila), Hess, S. (Shelley), MacDonald, S. (Shelley), Evans, S. (Simone), Bzovsky, S. (Sofia), Hasselund, S. (Sondre), Lewis, S. (Sophie), Ugland, S. (Stein), Caminiti, S. (Stephanie), Tanner, S.L. (Stephanie L.), Zielinski, S.M. (Stephanie), Shepard, S. (Stephanie), Sems, S.A. (Stephen A.), Walter, S.D. (Stephen D.), Doig, S. (Stephen), Finley, S.H. (Stephen H.), Kates, S. (Stephen), Lindenbaum, S. (Stephen), Kingwell, S.P. (Stephen P.), Csongvay, S. (Steve), Papp, S. (Steve), Buijk, S.E. (Steven E.), Rhemrev, S. (Steven), Hollenbeck, S.M. (Steven M.), van Gaalen, S.M. (Steven M.), Yang, S. (Steven), Weinerman, S. (Stuart), Subash, (), Lambert, S. (Sue), Liew, S. (Susan), Meylaerts, S.A.G. (Sven), Blokhuis, T.J. (Taco J.), de Vries Reilingh, T.S. (Tammo S.), Lona, T. (Tarjei), Scott, T. (Taryn), Swenson, T.K. (Teresa K.), Endres, T.J. (Terrence J.), Axelrod, T. (Terry), van Egmond, T. (Teun), Pace, T.B. (Thomas B.), Kibsgård, T. (Thomas), Schaller, T.M. (Thomas M.), Ly, T.V. (Thuan V.), Miller, T.J. (Timothy J.), Weber, T. (Timothy), Le, T. (Toan), Oliver, T.M. (Todd M.), Karsten, T.M. (Thomas), Borch, T. (Tor), Hoseth, T.M. (Tor Magne), Nicolaisen, T. (Tor), Ianssen, T. (Torben), Rutherford, T. (Tori), Nanney, T. (Tracy), Gervais, T. (Trevor), Stone, T. (Trevor), Schrickel, T. (Tyson), Scrabeck, T. (Tyson), Ganguly, U. (Utsav), Naumetz, V. (V.), Frizzell, V. (Valda), Wadey, V. (Veronica), Jones, V. (Vicki), Avram, V. (Victoria), Mishra, V. (Vimlesh), Yadav, V. (Vineet), Arora, V. (Vinod), Tyagi, V. (Vivek), Borsella, V. (Vivian), Willems, W.J. (Jaap), Hoffman, W.H. (W. H.), Gofton, W.T. (Wade T.), Lackey, W.G. (Wesley G.), Ghent, W. (Wesley), Obremskey, W. (William), Oxner, W. (William), Cross, W.W. (William W.), Murtha, Y.M. (Yvonne M.), and Murdoch, Z. (Zoe)

Abstract

Background Reoperation rates are high after surgery for hip fractures. We investigated the effect of a sliding hip screw versus cancellous screws on the risk of reoperation and other key outcomes. Methods For this international, multicentre, allocation concealed randomised controlled trial, we enrolled patients aged 50 years or older with a low-energy hip fracture requiring fracture fixation from 81 clinical centres in eight countries. Patients were assigned by minimisation with a centralised computer system to receive a single large-diameter screw with a side-plate (sliding hip screw) or the present standard of care, multiple small-diameter cancellous screws. Surgeons and patients were not blinded but the data analyst, while doing the analyses, remained blinded to treatment groups. The primary outcome was hip reoperation within 24 months after initial surgery to promote fracture healing, relieve pain, treat infection, or improve function. Analyses followed the intention-to-treat principle. This study was registered with ClinicalTrials.gov, number NCT00761813. Findings Between Marc

Published
2017
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13. Resident education in orthopaedic trauma

Author

Nousiainen, M. T., primary, McQueen, S. A., additional, Hall, J., additional, Kraemer, W., additional, Ferguson, P., additional, Marsh, J. L., additional, Reznick, R. R., additional, Reed, M. R., additional, and Sonnadara, R., additional

Published
2016
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14. Complex Dynamic Systems View on Conceptual Change: How a Picture of Students' Intuitive Conceptions Accrue From Dynamically Robust Task Dependent Learning Outcomes.

Author

KOPONEN, I. T., KOKKONEN, T., and NOUSIAINEN, M.

Subjects
INTERACTIVE learning, FACILITATED learning
Abstract

We discuss here conceptual change and the formation of robust learning outcomes from the viewpoint of complex dynamic systems (CDS). The CDS view considers students' conceptions as context dependent and multifaceted structures which depend on the context of their application. In the CDS view the conceptual patterns (i.e. intuitive conceptions here) may be robust in a certain situation but are not formed, at least not as robust ones, in another situation. The stability is then thought to arise dynamically in a variety of ways and not so much to mirror rigid ontological categories or static intuitive conceptions. We use computational modelling to understand the generic dynamic and emergent features of that phenomenon. The model is highly simplified and idealized, but it shows how context dependence, described here by an epistemic landscape structure, leads to the formation of context dependent robust states that can be viewed as attractors in learning, and how owing to the sharply defined nature of these states, learning appears as a progression of switches from one state to another, giving thus the appearance of conceptual change as switches from one robust state to another. Finally, we discuss the implications of the results in directing attention to the design of learning tasks and their structure, and how empirically accessible learning outcomes might be related to these underlying factors. [ABSTRACT FROM AUTHOR]

Published
2017
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22. Surgical simulation training in orthopedics: current insights

Author

Kalun P, Wagner N, Yan J, Nousiainen MT, and Sonnadara RR

Subjects
Orthopaedics, simulation, postgraduate medical education, Special aspects of education, LC8-6691, Medicine (General), R5-920
Abstract

Portia Kalun,1 Natalie Wagner,1 James Yan,2 Markku T Nousiainen,3 Ranil R Sonnadara1,4 1Office of Education Science, Department of Surgery, McMaster University, Hamilton, ON, Canada; 2Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, ON, Canada; 3Division of Orthopaedic Surgery, Department of Surgery, University of Toronto, Toronto, ON, Canada; 4Department of Surgery, University of Toronto, Toronto, ON, Canada Background: While the knowledge required of residents training in orthopedic surgery continues to increase, various factors, including reductions in work hours, have resulted in decreased clinical learning opportunities. Recent work suggests residents graduate from their training programs without sufficient exposure to key procedures. In response, simulation is increasingly being incorporated into training programs to supplement clinical learning. This paper reviews the literature to explore whether skills learned in simulation-based settings results in improved clinical performance in orthopedic surgery trainees. Materials and methods: A scoping review of the literature was conducted to identify papers discussing simulation training in orthopedic surgery. We focused on exploring whether skills learned in simulation transferred effectively to a clinical setting. Experimental studies, systematic reviews, and narrative reviews were included. Results: A total of 15 studies were included, with 11 review papers and four experimental studies. The review articles reported little evidence regarding the transfer of skills from simulation to the clinical setting, strong evidence that simulator models discriminate among different levels of experience, varied outcome measures among studies, and a need to define competent performance in both simulated and clinical settings. Furthermore, while three out of the four experimental studies demonstrated transfer between the simulated and clinical environments, methodological study design issues were identified. Conclusion: Our review identifies weak evidence as to whether skills learned in simulation transfer effectively to clinical practice for orthopedic surgery trainees. Given the increased reliance on simulation, there is an immediate need for comprehensive studies that focus on skill transfer, which will allow simulation to be incorporated effectively into orthopedic surgery training programs. Keywords: orthopedics, simulation, postgraduate medical education, scoping review, transfer

Published
2018

26. EM Sampo soundings in the Outokumpu region.

Author

Nousiainen M., Levaniemi H., Nousiainen M., and Levaniemi H.

Abstract

A frequency-domain electromagnetic (EM) Sampo Gefinex 400S survey at Perttilahti, Finland, is described and Sampo datasets from Miihkali and Kylylahti are reviewed. There is an abundance of highly conductive black schists in the Outokumpu region which, even as thin layers, can mask other nearby or underlying conductors such as ore bodies. The conductors detected in the new Perttilahti Sampo deep-penetrating electromagnetic survey are assumed to be black schists but their location may not be correctly detected with the available one-dimensional interpretation method due to various three-dimensional effects such as that of the 35-40 degree dip of the structures. It is concluded that although a correctly interpreted conductivity structure related to black schists may lead to traces of Outokumpu-association rocks, direct geophysical exploration for sulphide ore still seems a demanding task in this region. Careful survey planning, synthetic advance modelling, result interpretation and validation with all available reference data in a 3D environment become increasingly important as the complexity of the problem grows., A frequency-domain electromagnetic (EM) Sampo Gefinex 400S survey at Perttilahti, Finland, is described and Sampo datasets from Miihkali and Kylylahti are reviewed. There is an abundance of highly conductive black schists in the Outokumpu region which, even as thin layers, can mask other nearby or underlying conductors such as ore bodies. The conductors detected in the new Perttilahti Sampo deep-penetrating electromagnetic survey are assumed to be black schists but their location may not be correctly detected with the available one-dimensional interpretation method due to various three-dimensional effects such as that of the 35-40 degree dip of the structures. It is concluded that although a correctly interpreted conductivity structure related to black schists may lead to traces of Outokumpu-association rocks, direct geophysical exploration for sulphide ore still seems a demanding task in this region. Careful survey planning, synthetic advance modelling, result interpretation and validation with all available reference data in a 3D environment become increasingly important as the complexity of the problem grows.

27. ZTEM survey in the Outokumpu region.

Author

Kurimo M., Lahti I., Nousiainen M., Kurimo M., Lahti I., and Nousiainen M.

Abstract

A helicopter-borne geophysical survey over the Outokumpu mining camp area of Finland acquired 1 250 km of data at line spacings of 2 km, 1 km and 0.5 km with geophysical sensors that included a Z-axis tipper electromagnetic (ZTEM) system and a caesium magnetometer. Results included in- and cross-line ZTEM tipper components at frequencies of 25, 37, 75, 150, 300 and 600 Hz, total magnetic intensity data and various derivatives of ZTEM tipper data. Although the two-dimensional, three-dimensional and high-resolution 3D inversion results are generally in good agreement, showing similar locations of conductive zones but with considerable depth variation, the 3D inversion model with the finest mesh yields the best results. In general, black schists and sulphides have low resistivity and thus can be interpreted as conductors in this type of data; the report finds it unlikely that ZTEM would respond directly to Outokumpu deposits, but that it images the black shale and serpentinite units and possibly the surrounding hydrothermal mineralised halo., A helicopter-borne geophysical survey over the Outokumpu mining camp area of Finland acquired 1 250 km of data at line spacings of 2 km, 1 km and 0.5 km with geophysical sensors that included a Z-axis tipper electromagnetic (ZTEM) system and a caesium magnetometer. Results included in- and cross-line ZTEM tipper components at frequencies of 25, 37, 75, 150, 300 and 600 Hz, total magnetic intensity data and various derivatives of ZTEM tipper data. Although the two-dimensional, three-dimensional and high-resolution 3D inversion results are generally in good agreement, showing similar locations of conductive zones but with considerable depth variation, the 3D inversion model with the finest mesh yields the best results. In general, black schists and sulphides have low resistivity and thus can be interpreted as conductors in this type of data; the report finds it unlikely that ZTEM would respond directly to Outokumpu deposits, but that it images the black shale and serpentinite units and possibly the surrounding hydrothermal mineralised halo.

28. The biomechanical analysis of three plating fixation systems for periprosthetic femoral fracture near the tip of a total hip arthroplasty

Author

Waddell James P, Nousiainen Markku T, Zdero Rad, Lever James P, and Schemitsch Emil H

Subjects
Orthopedic surgery, RD701-811, Diseases of the musculoskeletal system, RC925-935
Abstract

Abstract Background A variety of techniques are available for fixation of femoral shaft fractures following total hip arthroplasty. The optimal surgical repair method still remains a point of controversy in the literature. However, few studies have quantified the performance of such repair constructs. This study biomechanically examined 3 different screw-plate and cable-plate systems for fixation of periprosthetic femoral fractures near the tip of a total hip arthroplasty. Methods Twelve pairs of human cadaveric femurs were utilized. Each left femur was prepared for the cemented insertion of the femoral component of a total hip implant. Femoral fractures were created in the femurs and subsequently repaired with Construct A (Zimmer Cable Ready System), Construct B (AO Cable-Plate System), or Construct C (Dall-Miles Cable Grip System). Right femora served as matched intact controls. Axial, torsional, and four-point bending tests were performed to obtain stiffness values. Results All repair systems showed 3.08 to 5.33 times greater axial stiffness over intact control specimens. Four-point normalized bending (0.69 to 0.85) and normalized torsional (0.55 to 0.69) stiffnesses were lower than intact controls for most comparisons. Screw-plates provided either greater or equal stiffness compared to cable-plates in almost all cases. There were no statistical differences between plating systems A, B, or C when compared to each other (p > 0.05). Conclusions Screw-plate systems provide more optimal mechanical stability than cable-plate systems for periprosthetic femur fractures near the tip of a total hip arthroplasty.

Published
2010
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29. Entrustable Professional Activities in Orthopaedics.

Author

Watson A, Leroux T, Ogilvie-Harris D, Nousiainen M, Ferguson PC, Murnahan L, and Dwyer T

Abstract

Background: An entrustable professional activity (EPA) is defined as a core task of a specialty that is entrusted to a trainee once sufficient competence has been reached. A group of EPAs reflects the activities that clinicians commonly do on a day-to-day basis. Lists of EPAs have been created for most medical subspecialties, but not orthopaedic surgery. The aim of this study was to create a peer-reviewed list of essential EPAs that a resident must perform independently before completing orthopaedic residency training., Methods: A focus group of 7 orthopaedic surgeons from the University of Toronto developed a comprehensive list of 285 EPAs. For each subspecialty group, the opinions of at least 15 academic and nonacademic surgeons, as well as subspecialty-trained and non-subspecialty-trained surgeons, were used. The modified Delphi method was used to rank EPAs on a five-point scale from not important to mandatory for a resident to competent before exiting training. Two Delphi rounds were used, using a threshold of >50% of surgeons considering the EPA as mandatory before being considered for the next round. A final list of EPAs was ratified using the focus group of academic surgeons involved in the study., Results: Seventy-five (75) of 107 (70%) surgeons invited responded to the survey. Nearly half (129) of the 285 EPAs were discarded after the first round of Delphi. A further 118 EPAs were discarded after the second Delphi round, leaving 49 final EPAs, across 9 subspecialties in orthopaedic surgery., Conclusions: Expert consensus was used to create a list of EPAs considered mandatory for completion of resident training in orthopaedics in our province. The final 49 peer-reviewed EPAs will be a valuable benchmark in curriculum design and assessment in orthopaedic surgery in the competency-based era for other programs., Competing Interests: Disclosure: The Disclosure of Potential Conflicts of Interest forms are provided with the online version of the article (http://links.lww.com/JBJSOA/A245)., (Copyright © 2021 The Authors. Published by The Journal of Bone and Joint Surgery, Incorporated. All rights reserved.)

Published
2021
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30. What can regulatory bodies do to help implement competency-based medical education?

Author

Nousiainen M, Scheele F, Hamstra SJ, and Caverzagie K

Subjects
Canada, Competency-Based Education, Humans, Netherlands, Education, Medical, Physicians
Abstract

In response to the numerous challenges resident trainees currently face in their ability to competently acquire the requisite skills, knowledge and attitudes upon graduation, medical educators have looked to a competency-based medical education (CBME) approach as a possible solution. As CBME has already been implemented in many jurisdictions around the world, certain challenges in implementation have been experienced. One important challenge identified relates to how regulatory bodies can either assist or unintentionally hinder implementation. By examining the varied experiences from Canada, the USA and the Netherlands in implementing CBME, this paper identifies how regulatory bodies can support and advance worldwide efforts of furthering its implementation. If regulatory bodies restructure accreditation and regulatory criteria to align with CBME principles, work together in a coordinated fashion to ensure alignment of vital regulatory meaures throughout the training and practice continuum of a physician, and allow for (if not incentivize) individuals and programs to be innovative in adapting CBME to meet their local environments, it is likely that the worldwide implementation of CBME will occur successfully.

Published
2020
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31. Can We Agree on Expectations and Assessments of Graduating Residents?: 2016 AOA Critical Issues Symposium.

Author

Nousiainen M, Incoll I, Peabody T, and Marsh JL

Subjects
Australia, Canada, Clinical Competence standards, Curriculum, Faculty, Medical, Humans, Orthopedics standards, Professionalism standards, Competency-Based Education methods, Internship and Residency, Orthopedics education
Abstract

Orthopaedic educators are responsible for training a prepared and competent workforce that will provide effective care for a growing number of patients with musculoskeletal conditions. Currently, there are both internal and external forces that pose substantial challenges to medical students, residents, program directors, faculty members, and chairs in achieving this goal. One area of particular concern is the education of surgeons, whose knowledge and professional behavior must be matched by their ability to acquire procedural skills. In order to address this issue, many training systems have implemented a competency-based training approach into their curricula. This article discusses the efforts that orthopaedic training bodies in Canada and Australia have taken toward competency-based education and what steps the American Board of Orthopaedic Surgery (ABOS), the Council of Orthopaedic Residency Directors (CORD), the American Orthopaedic Association (AOA), the American Academy of Orthopaedic Surgeons (AAOS), and the Accreditation Council for Graduate Medical Education (ACGME) are considering to improve residency education in the current and future environments.

Published
2017
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32. Potential reference measurement procedures for PBDE in surface water at levels required by the EU Water Frame Directive.

Author

Swart C, Gantois F, Petrov P, Entwisle J, Goenaga-Infante H, Nousiainen M, Bílsel M, Binici B, Gonzalez-Gago A, Pröfrock D, and Gören AC

Subjects
Environmental Monitoring methods, Humans, Limit of Detection, Liquid-Liquid Extraction methods, Solid Phase Extraction methods, Spectrophotometry, Atomic, Environmental Monitoring legislation & jurisprudence, Flame Retardants isolation & purification, Fresh Water chemistry, Halogenated Diphenyl Ethers isolation & purification, Water Pollutants, Chemical isolation & purification
Abstract

Polybrominated diphenylethers (PBDE), used as flame retardants, are named as priority substances in the Directive 2000/60/EC of the European parliament and of the council establishing a framework for Community action in the field of water policy. An annual average environmental quality standard (EQS) for inland surface waters of 0.0005 µg/L (0.0002 µg/L for other surface waters) for PBDE congeners involved in the technical penta-PBDE mixtures containing PBDE with five bromine atoms has been established. The directives focus especially on the congeners PBDE 28, 47, 99, 100, 153 and 154 contained in the penta-PBDE mixture. Up to now, no reference measurement procedures have been established reaching the limits of quantification (LOQs) and the associated uncertainties as defined in the directives with results traceable to the SI. Within a recent European project on metrology, different approaches for the traceable quantification of PBDE, based on liquid/liquid or solid phase extraction followed by the detection with gas chromatography coupled to either inductively coupled plasma mass spectrometry or triple quadrupole mass spectrometry, were investigated and the related LOQs and expanded uncertainties of the results were compared. A complete uncertainty budget for each method was estimated according to the Guide to the Expression of Uncertainty in Measurement (GUM). All presented analytical procedures can serve as reference measurement procedures regarding the LOQs and their associated expanded uncertainties for monitoring the six priority PBDEs named above. LOQs as low as 0.026 ng/kg with an associated expanded uncertainty of 0.002 ng/kg could be achieved., (Copyright © 2016 The Authors. Published by Elsevier B.V. All rights reserved.)

Published
2016
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33. Cognitive and Psychomotor Entrustable Professional Activities: Can Simulators Help Assess Competency in Trainees?

Author

Dwyer T, Wadey V, Archibald D, Kraemer W, Shantz JS, Townley J, Ogilvie-Harris D, Petrera M, Ferguson P, and Nousiainen M

Subjects
Ankle Fractures surgery, Arthroplasty, Replacement, Knee education, Checklist, Clinical Competence, Curriculum, Educational Status, Fracture Fixation education, Hip Fractures surgery, Humans, Program Evaluation, Reproducibility of Results, Task Performance and Analysis, Time Factors, Video Recording, Cognition, Computer Simulation, Computer-Assisted Instruction methods, Education, Medical, Graduate methods, Models, Anatomic, Orthopedic Procedures education, Psychomotor Performance, Teaching methods
Abstract

Background: An entrustable professional activity describes a professional task that postgraduate residents must master during their training. The use of simulation to assess performance of entrustable professional activities requires further investigation., Questions/purposes: (1) Is simulation-based assessment of resident performance of entrustable professional activities reliable? (2) Is there evidence of important differences between Postgraduate Year (PGY)-1 and PGY-4 residents when performing simulated entrustable professional activities?, Methods: Three entrustable professional activities were chosen from a list of competencies: management of the patient for total knee arthroplasty (TKA); management of the patient with an intertrochanteric hip fracture; and management of the patient with an ankle fracture. Each assessment of entrustable professional activity was 40 minutes long with three components: preoperative management of a patient (history-taking, examination, image interpretation); performance of a technical procedure on a sawbones model; and postoperative management of a patient (postoperative orders, management of complications). Residents were assessed by six faculty members who used checklists based on a modified Delphi technique, an overall global rating scale as well as a previously validated global rating scale for the technical procedure component of each activity. Nine PGY-1 and nine PGY-4 residents participated in our simulated assessment. We assessed reliability by calculating the internal consistency of the mean global rating for each activity as well as the interrater reliability between the faculty assessment and blinded review of videotaped encounters. We sought evidence of a difference in performance between PGY-1 and PGY-4 residents on the overall global rating scale for each station of each entrustable professional activity., Results: The reliability (Cronbach's α) for the hip fracture activity was 0.88, it was 0.89 for the ankle fracture activity, and it was 0.84 for the TKA activity. A strong correlation was seen between blinded observer video review and faculty scores (mean 0.87 [0.07], p < 0.001). For the hip fracture entrustable professional activity, the PGY-4 group had a higher mean global rating scale than the PGY-1 group for preoperative management (3.56 [0.5] versus 2.33 [0.5], p < 0.001), postoperative management (3.67 [0.5] versus 2.22 [0.7], p < 0.001), and technical procedures (3.11 [0.3] versus 3.67 [0.5], p = 0.015). For the TKA activity, the PGY-4 group scored higher for postoperative management (3.5 [0.8] versus 2.67 [0.5], p = 0.016) and technical procedures (3.22 [0.9] versus 2.22 [0.9], p = 0.04) than the PGY-1 group, but no difference for preoperative management with the numbers available (PGY-4, 3.44 [0.7] versus PGY-1 2.89 [0.8], p = 0.14). For the ankle fracture activity, the PGY-4 group scored higher for postoperative management (3.22 [0.8] versus 2.33 [0.7], p = 0.18) and technical procedures (3.22 [1.2] versus 2.0 [0.7], p = 0.018) than the PGY-1 groups, but no difference for preoperative management with the numbers available (PGY-4, 3.22 [0.8] versus PGY-1, 2.78 [0.7], p = 0.23)., Conclusions: The results of our study show that simulated assessment of entrustable professional activities may be used to determine the ability of a resident to perform professional tasks that are critical components of medical training. In this manner, educators can ensure that competent performance of these skills in the simulated setting occurs before actual practice with patients in the clinical setting.

Published
2016
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34. Student-led learning: a new teaching paradigm for surgical skills.

Author

Hoogenes J, Mironova P, Safir O, McQueen SA, Abdelbary H, Drexler M, Nousiainen M, Ferguson P, Kraemer W, Alman B, Reznick RK, and Sonnadara RR

Subjects
Adult, Clinical Competence, Cooperative Behavior, Feedback, Psychological, Female, Humans, Male, Ontario, Self Efficacy, Competency-Based Education methods, Internship and Residency methods, Models, Educational, Orthopedics education
Abstract

Background: Competency-based education and simulation are being used more frequently in surgical skills curricula. We explored a novel student-led learning paradigm, which allows trainees to become more active participants in the learning process while maintaining expert guidance and supervision., Methods: Twelve first-year orthopedic residents were randomized to either a student-led (SL) or a traditional instructor-led group during an intensive, month-long, laboratory-based technical skills training course. A rigorous qualitative-description approach was used for analysis., Results: Four prominent themes emerged: instructional style, feedback, peer and instructor collaboration, and self-efficacy. Compared with the instructor-led group, there was more peer assistance, feedback, collaboration, and hands-on and active learning observed in the SL group., Conclusions: The flexible and socially rich nature of the SL learning environment may aid in development of both technical and nontechnical skills early in residency and ultimately privilege later clinical learning., (Copyright © 2015 Elsevier Inc. All rights reserved.)

Published
2015
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35. Letter to the editor response.

Author

Sonnadara RR, Mui C, McQueen S, Mironova P, Nousiainen M, Safir O, Kraemer W, Ferguson P, Alman B, and Reznick R

Subjects
General Surgery education, Internship and Residency
Published
2014
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36. How to assess communication, professionalism, collaboration and the other intrinsic CanMEDS roles in orthopedic residents: use of an objective structured clinical examination (OSCE).

Author

Dwyer T, Glover Takahashi S, Kennedy Hynes M, Herold J, Wasserstein D, Nousiainen M, Ferguson P, Wadey V, Murnaghan ML, Leroux T, Semple J, Hodges B, and Ogilvie-Harris D

Subjects
Canada, Clinical Competence, Humans, Orthopedics standards, Reproducibility of Results, Communication, Cooperative Behavior, Education, Medical, Graduate standards, Educational Measurement methods, Internship and Residency standards, Orthopedics education, Physician's Role
Abstract

Background: Assessing residents' understanding and application of the 6 intrinsic CanMEDS roles (communicator, professional, manager, collaborator, health advocate, scholar) is challenging for postgraduate medical educators. We hypothesized that an objective structured clinical examination (OSCE) designed to assess multiple intrinsic CanMEDS roles would be sufficiently reliable and valid., Methods: The OSCE comprised 6 10-minute stations, each testing 2 intrinsic roles using case-based scenarios (with or without the use of standardized patients). Residents were evaluated using 5-point scales and an overall performance rating at each station. Concurrent validity was sought by correlation with in-training evaluation reports (ITERs) from the last 12 months and an ordinal ranking created by program directors (PDs)., Results: Twenty-five residents from postgraduate years (PGY) 0, 3 and 5 participated. The interstation reliability for total test scores (percent) was 0.87, while reliability for each of the communicator, collaborator, manager and professional roles was greater than 0.8. Total test scores, individual station scores and individual CanMEDS role scores all showed a significant effect by PGY level. Analysis of the PD rankings of intrinsic roles demonstrated a high correlation with the OSCE role scores. A correlation was seen between ITER and OSCE for the communicator role, while the ITER medical expert and total scores highly correlated with the communicator, manager and professional OSCE scores., Conclusion: An OSCE designed to assess the intrinsic CanMEDS roles was sufficiently valid and reliable for regular use in an orthopedic residency program.

Published
2014
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39. Determination of chlorophenols in water by headspace solid phase microextraction ion mobility spectrometry (HS-SPME-IMS).

Author

Holopainen S, Luukkonen V, Nousiainen M, and Sillanpää M

Subjects
Environmental Monitoring methods, Finland, Lakes chemistry, Mass Spectrometry methods, Solid Phase Microextraction, Chlorophenols analysis, Water Pollutants, Chemical analysis
Abstract

Chlorophenols (CPs) as persistent toxic compounds are of worldwide environmental concern. Usage of chlorinated phenols, especially pentachlorophenol (PCP), has been restricted or widely banned in many countries due to their possible adverse health effects even at low concentrations. Ion mobility spectrometry (IMS) has received increasing interest in environmental applications due to its unique characteristics, such as portability and speed of analysis. A range of sample introduction methods combined with IMS enable analysis from different environmental matrices. This study utilised headspace solid phase microextraction IMS (HS-SPME-IMS) in the determination of CPs from water samples. The extraction conditions were examined and the method was applied to real water samples. The developed method is suitable to detect CPs at milligram per liter level in water. Based on the results, SPME-IMS setup is feasible as an early warning system for water monitoring of pollutants present in drinking or surface water in case of environmental accidents or leakages., (Copyright © 2013 Elsevier B.V. All rights reserved.)

Published
2013
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40. Toronto orthopaedic boot camp III: examining the efficacy of student-regulated learning during an intensive, laboratory-based surgical skills course.

Author

Sonnadara RR, Garbedian S, Safir O, Mui C, Mironova P, Nousiainen M, Ferguson P, Alman B, Kraemer W, and Reznick R

Subjects
Humans, Laboratories, Students, Clinical Competence, General Surgery education, Internship and Residency, Learning, Orthopedics education
Abstract

Background: Previous studies have presented compelling data that a 1-month "boot-camp"-style course can be a highly effective mechanism for teaching and developing targeted technical skills. In the current study, we examine whether performance of these targeted skills is improved when residents are trained using directed, student-led (SL) learning methods compared with traditional instructor-led (IL) learning methods., Methods: Twelve first-year orthopedic residents began their training with a 1-month, intensive skills course. Six residents were taught basic surgical skills using a format that focused on deliberate, SL exploration and practice of the skills under instructor supervision (SL group). The remaining residents were taught the same surgical skills using more traditional IL methods that included complete demonstration of the surgical task by an orthopedic surgeon, followed by an extended period of instruction (IL group). Performance on 4 targeted technical skills (sawing, bone drilling, suturing, and plaster splint application) was tested using an objective, structured assessment of technical skills examination for the 2 groups at the beginning and the end of the skills course., Results: Before the start of the skills course, there were no differences in performance scores between the 2 groups. On completion of the skills course, mean global rating scores for the 4 surgical skills tasks were greater for the SL group compared with the IL group: SL, 3.95 ± 0.1; IL, 3.42 ± 0.1; F(1,10) = 7.66 P < .02. A similar pattern of results was revealed by the checklists scores, with the SL group outperforming the IL group: SL, 94.9 ± 2.1; IL, 86.4 ± 2.1; F(1,10) = 8.512; P < .02., Conclusion: Previous work has demonstrated the effectiveness of teaching basic surgical skills through an intensive course at the onset of residency. The present study shows that allowing surgical trainees to take a directed, student-regulated approach to learning basic surgical skills can further improve performance of these skills., (Copyright © 2013. Published by Mosby, Inc.)

Published
2013
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41. Determination of fuel ethers in water by membrane extraction ion mobility spectrometry.

Author

Holopainen S, Nousiainen M, and Sillanpää M

Subjects
Chemical Fractionation, Fossil Fuels, Humans, Membranes, Artificial, Spectrophotometry, Atomic, Drinking Water chemistry, Ethers isolation & purification, Ethyl Ethers isolation & purification, Methyl Ethers isolation & purification, Water Pollutants, Chemical isolation & purification
Abstract

Fuel oxygenates are environmentally detrimental compounds due to their rapid migration to groundwater. Fuel oxygenates have been reported to cause taste and odour problems in drinking water, and they also have long-term health effects. Feasible analytical methods are required to observe the presence of fuel oxygenates in drinking and natural water. The authors studied ion mobility spectrometry (IMS) to determinate isomeric fuel ether oxygenates; ethyl tert-butyl ether (ETBE), diisopropyl ether (DIPE), and tert-amyl methyl ether (TAME), separated from aqueous matrices with a pervaporation membrane module. Methyl tert-butyl ether (MTBE) was also membrane extracted and detected with IMS. The authors demonstrated that fuel ethers (MTBE, ETBE, DIPE, and TAME) can be quantified at μg/L level with membrane extraction IMS. A membrane extraction module coupled to IMS is a time and cost effective analysis method because sampling can be performed in a single procedure and from different natural water matrices within a few minutes. Consequently, IMS combined with membrane extraction is suitable not only for waterworks and other online applications but also in the field monitoring the quality of drinking and natural water., (Copyright © 2013 Elsevier B.V. All rights reserved.)

Published
2013
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42. Orthopaedic Boot Camp II: examining the retention rates of an intensive surgical skills course.

Author

Sonnadara RR, Garbedian S, Safir O, Nousiainen M, Alman B, Ferguson P, Kraemer W, and Reznick R

Subjects
Educational Measurement, Humans, Task Performance and Analysis, Teaching, Time Factors, Clinical Competence standards, Curriculum, Internship and Residency standards, Orthopedics education, Retention, Psychology
Abstract

Background: We examined retention rates for basic surgical skills taught through a 1-month intensive laboratory boot camp-style course at the onset of residency., Methods: We present data from 3 groups, each composed of 6 residents. The first group consisted of residents from a new competency-based curriculum (CBC). They started residency training with the Toronto Orthopaedic Boot Camp course. The other 2 groups were junior (JR) and senior (SR) residents from a traditional program whose residency training included no such course. Performance on targeted technical skills was tested using an objective structured assessment of technical skills examination 7 months after the onset of training for the CBC and JR groups and at least 43 months after the onset of training for the SR group., Results: The mean global rating scale score for the CBC group immediately after the skills course was 4.3, which was maintained 6 months later. There were no significant performance differences between the CBC and SR groups. Both the CBC and SR groups performed significantly better than the JR group (mean global rating scale 3.7; F[2, 15] = 12.269, P < .001)., Conclusion: We conclude that a surgical skills course at the onset of residency is an effective mechanism for teaching targeted technical skills and that skills taught in this manner can have excellent retention rates. Furthermore, an early focus on technical skills allows junior residents to perform at the same level as senior residents for certain tasks and may privilege later learning., (Copyright © 2012. Published by Mosby, Inc.)

Published
2012
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43. Ion spectrometric detection technologies for ultra-traces of explosives: a review.

Author

Mäkinen M, Nousiainen M, and Sillanpää M

Abstract

In recent years, explosive materials have been widely employed for various military applications and civilian conflicts; their use for hostile purposes has increased considerably. The detection of different kind of explosive agents has become crucially important for protection of human lives, infrastructures, and properties. Moreover, both the environmental aspects such as the risk of soil and water contamination and health risks related to the release of explosive particles need to be taken into account. For these reasons, there is a growing need to develop analyzing methods which are faster and more sensitive for detecting explosives. The detection techniques of the explosive materials should ideally serve fast real-time analysis in high accuracy and resolution from a minimal quantity of explosive without involving complicated sample preparation. The performance of the in-field analysis of extremely hazardous material has to be user-friendly and safe for operators. The two closely related ion spectrometric methods used in explosive analyses include mass spectrometry (MS) and ion mobility spectrometry (IMS). The four requirements-speed, selectivity, sensitivity, and sampling-are fulfilled with both of these methods., (Copyright © 2011 Wiley Periodicals, Inc.)

Published
2011
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44. Fast detection of methyl tert-butyl ether from water using solid phase microextraction and ion mobility spectrometry.

Author

Nousiainen M, Holopainen S, Puton J, and Sillanpää M

Subjects
Calibration, Methyl Ethers analysis, Solid Phase Microextraction, Spectrum Analysis methods, Water Pollutants, Chemical analysis
Abstract

Methyl tert-butyl ether (MTBE) is commonly used as chemical additive to increase oxygen content and octane rating of reformulated gasoline. Despite its impact on enhancing cleaner combustion of gasoline, MTBE poses a threat to surface and ground water when gasoline is released into the environment. Methods for onsite analysis of MTBE in water samples are also needed. A less common technique for MTBE detection from water is ion mobility spectrometry (IMS). We describe a method for fast sampling and screening of MTBE from water by solid phase microextraction (SPME) and IMS. MTBE is adsorbed from the head space of a sample to the coating of SPME fiber. The interface containing a heated sample chamber, which couples SPME and IMS, was constructed and the SPME fiber was introduced into the sample chamber for thermal desorption and IMS detection of MTBE vapors. The demonstrated SPME-IMS method proved to be a straightforward method for the detection of trace quantities of MTBE from waters including surface and ground water. We determined the relative standard deviation of 8.3% and detection limit of 5 mg L(-1) for MTBE. Because of short sampling, desorption, and detection times, the described configuration of combined SPME and IMS is a feasible method for the detection of hazardous substances from environmental matrices., (Copyright © 2011 Elsevier B.V. All rights reserved.)

Published
2011
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45. Processing of the signal from detectors used in ion mobility spectrometry.

Author

Dziewiecki W, Holopainen S, Knap A, Nousiainen M, Siodłowski B, Sillanpää M, and Puton J

Abstract

The output signal generated by detectors used in ion mobility spectrometry (IMS) is a time-dependent, small ionic current. To be able to take full advantage of information contained in this signal, adequate procedures of signal processing need to be utilized. Methods of spectrum filtration, peak separation, base-line correction as well as one- and two-dimensional integration applied in quantitative analysis are described. The effectiveness of the chosen methods was demonstrated on examples of experimental results obtained by IMS. Measurements were performed for spectra of reactant ions and sample ions generated by acetone, methyl tert-butyl ether (MTBE), dimethyl methylphosphonate (DMMP) and benzene. It was demonstrated that the proposed methods considerably improve the quality of the spectra, increase the selectivity of detection and reduce the uncertainty of quantitative measurements.

Published
2010
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46. Acetabular component revision in total hip arthroplasty. Part II: management of major bone loss and pelvic discontinuity.

Author

Issack PS, Nousiainen M, Beksac B, Helfet DL, Sculco TP, and Buly RL

Subjects
Arthroplasty, Replacement, Hip instrumentation, Bone Transplantation, Hip Prosthesis, Humans, Prosthesis Design, Acetabulum surgery, Arthroplasty, Replacement, Hip methods, Pelvic Bones surgery
Abstract

Use of structural bone graft and/or reconstruction cage devices in acetabular revisions with major bone loss has the advantages of providing a stable construct at the anatomical hip center of rotation and, theoretically, reconstituting bone stock. When the structural graft supports more than 50% of the acetabular component, a reconstruction cage device spanning ilium to ischium should be used to protect the graft and provide structural stability. Recent introduction of trabecular metal cups and augments and custom triflanged acetabular components has increased the potential for biological fixation and long-term stability of revision constructs. Longer follow-up of these reconstructions is needed. Revisions with pelvic discontinuity and major bone loss have a high failure rate and require techniques either to reduce and plate the discontinuity or to distract the discontinuity to achieve long-term stability.

Published
2009

47. Acetabular component revision in total hip arthroplasty. Part I: cementless shells.

Author

Issack PS, Nousiainen M, Beksac B, Helfet DL, Sculco TP, and Buly RL

Subjects
Acetabulum diagnostic imaging, Bone Cements, Cementation, Device Removal, Humans, Osteotomy, Radiography, Acetabulum surgery, Arthroplasty, Replacement, Hip, Postoperative Complications surgery, Reoperation methods
Abstract

Magnitude and location of acetabular bone defects dictate the type of reconstruction required. For the majority of reconstructions, a porous-coated hemispheric shell secured to host bone with multiple screws is the implant of choice. This reconstruction is feasible provided at least 50% of the implant contacts host bone. When such contact is not possible, and there is adequate medial and peripheral bone, techniques using alternative uncemented implants can be used for acetabular reconstruction. An uncemented cup can be placed at a "high hip center." Alternatively, the acetabular cavity can be progressively reamed to accommodate extra-large cups. Oblong cups, which take advantage of the oval-shaped cavity resulting from many failed acetabular components, can also be used. The success of these cementless techniques depends on the degree and location of bone loss and on the presence of pelvic discontinuity.

Published
2009

48. Ion mobility spectrometers with doped gases.

Author

Puton J, Nousiainen M, and Sillanpää M

Subjects
Ions chemistry, Organic Chemicals analysis, Gases chemistry, Spectrum Analysis methods
Abstract

Ion mobility spectrometry (IMS) is an instrumental technique used successfully for the detection of wide range of organic compounds in the gas phase. In this paper, advances in using special substances called dopants for gases flowing through IMS detectors are reviewed. These substances influence the ion-molecule chemistry in sample ionisation region as well as change conditions for the drift of ions. Improved selectivity and sensitivity of detection can be obtained by the use of dopants. In some cases, especially when measurements are conducted in the presence of different substances disturbing detection, the use of dopants is indispensable. The theory of the function of dopants is based on the knowledge of ion-molecule reactions. Fundamental information about these reactions is presented here. Mechanisms of changing the composition of ions produced in reactant section of IMS detector are explained on this basis. The most commonly used dopants are acetone and ammonia for positive mode and chloride for negative mode IMS. Other substances, such as higher ketones, organophosphorous compounds or methyl salicylate are used for special purposes and are selected for given analytical problem. Particular examples for the application of these substances are described.

Published
2008
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49. Determination of gas phase triacetone triperoxide with aspiration ion mobility spectrometry and gas chromatography-mass spectrometry.

Author

Räsänen RM, Nousiainen M, Peräkorpi K, Sillanpää M, Polari L, Anttalainen O, and Utriainen M

Abstract

Aspiration ion mobility spectrometry (IMS) has been used for the first time to screen 3,3,6,6,9,9-hexamethyl-1,2,4,5,7,8-hexaoxacyclononane explosive, the most commonly known as triacetone triperoxide (TATP). Gaseous TATP was generated from synthesized solid compound, sublimed and directed to a portable chemical detection system comprised of an aspiration-type IMS detector and six semiconductor sensors. Different unknown TATP gas phase concentrations were produced and corresponding IMS and semiconductor responses were measured. The experimental concentrations were determined by gas chromatography-mass spectrometry (GC-MS). The results evidenced that the monitored compound in the gas phase was TATP. In addition, the determined TATP concentrations and corresponding IMS intensities showed that the IMS response values were proportional to the measured TATP concentrations.

Published
2008
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50. Comparison of expert instruction and computer-based video training in teaching fundamental surgical skills to medical students.

Author

Nousiainen M, Brydges R, Backstein D, and Dubrowski A

Subjects
Aptitude, Clinical Competence, Competency-Based Education, Curriculum, Education, Educational Measurement, Humans, Students, Medical, Teaching, Video Recording, Computer-Assisted Instruction, Education, Medical, Undergraduate methods, General Surgery education, Surgical Procedures, Operative education, Suture Techniques education
Abstract

Background: Practice using computer-based video instruction (CBVI) leads to improvements in surgical skills proficiency. This study investigated the benefits of the introduction of (a) learner-directed, interactive video training and (b) the addition of expert instruction on the learning and retention of the basic surgical skills of suturing and knot-tying in medical students., Methods: Using bench models, students were pre-tested on a suturing and knot-tying skill after viewing an instructional video. The students were then randomly assigned to three practice conditions: self-study with video; self-study with interactive video; or the combination of self-study with interactive video with the addition of subsequent expert instruction. All participants underwent 18 trials of practice in their assigned training condition. The effectiveness of training was assessed by an immediate post-test and a retention test one month later. Performance was evaluated using expert- and computer-based assessments. Data were analyzed using repeated-measures ANOVA., Results: There were no differences in expert- and computer-based assessments between groups at pre-test. Although all three groups demonstrated significant improvements on both measures between the pre- and post-tests as well as between pre-tests and retention-tests (P < .01), no significant differences were detected among the three groups., Conclusion: This study shows that in surgical novices, neither the inclusion of expert instruction nor the addition of self-directed interaction with video leads to further improvements in skill development or retention. These findings further support the possible implementation of CBVI within surgical skills curricula.

Published
2008
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