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Supplemental material, DS_10.1177_0363546520952804 for Osteochondroplasty and Labral Repair for the Treatment of Young Adults With Femoroacetabular Impingement: A Randomized Controlled Trial by Olufemi R. Ayeni, Jon Karlsson, Diane Heels-Ansdell, Lehana Thabane, Volker Musahl, Nicole Simunovic, Andrew Duong, Mohit Bhandari, Asheesh Bedi, Teppo Järvinen, Douglas Naudie, Matti Seppänen, Gerard Slobogean, Matthew Skelly, Ajay Shanmugaraj, Sarah Crouch, Sheila Sprague, Lisa Buckingham, Tim Ramsay, John Lee, Petteri Kousa, Sasha Carsen, Hema Choudur, Yan Sim, Kelly Johnston, Sheila Sprague, Ivan Wong, Ryland Murphy, Sara Sparavalo, Daniel Whelan, Ryan Khan, Gavin C.A. Wood, Fiona Howells, Heather Grant, Douglas Naudie, Bryn Zomar, Michael Pollock, Kevin Willits, Andrew Firth, Stacey Wanlin, Alliya Remtulla, Nicole Kaniki, Etienne L. Belzile, Sylvie Turmel, Uffe Jørgensen, Annie Gam-Pedersen, Tays Hatanpää, Raine Sihvonen, Marko Raivio, Pirjo Toivonen and Mari Pirjetta Routapohja in The American Journal of Sports Medicine

© 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. Radiography is the predominant imaging modality used for the in-vivo analysis of orthopaedic implants. A major disadvantage of radiography is that the articulating joint components that are composed of radiolucent polyethylene cannot be directly visualized. Current strategies attempt to circumvent this limitation by estimating component positions and simplifying the joint system, however, these approaches lead to a number of associated errors. Thus, this study provides a method to enable the visualization of the polyethylene component of total knee replacements in radiographic images. This was achieved through the repeatable insertion of markers and accompanying registration process, which were evaluated in this study for reproducibility and accuracy. An insertion guide was developed to insert tantalum beads into polyethylene tibial surface liners. The bead-inserted liners were micro-CT scanned to obtain 3D surface geometries. An in-vivo mimicking phantom RSA experiment was then used to test the 3D to 2D registration process. The guide positioned the beads consistently to ±0.21 mm. The 3D to 2D registration demonstrated a repeatability of −0.014 ± 0.008 mm. Registration of different bead-inserted tibial liners to the phantom revealed an average error of 0.026 ± 0.047 mm for this visualization method. This visualization approach provides greatly improved registration and inter-component measurements than current alternative strategies. This process is suitable for a number of other joints and would greatly benefit procedures that analyze component interactions and implant performance over time. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:2017–2022, 2017.

© 2014 Elsevier Inc. Increased modularity of total hip arthroplasty components has occurred, with theoretical advantages and disadvantages. Recent literature indicates the potential for elevated revision rates of modular neck systems and the potential for local pseudotumor and metallosis formation at the modular neck/stem site. Retrieval analysis of one modular neck implant design including SEM (SCANNING ELECTRON MICROSCOPY) assessment was done and correlated with FEA (finite element analysis) as well as clinical features of patient demographics, implant and laboratory analysis. Correlation of the consistent corrosion locations to FEA indicates that the material and design features of this system may result in a biomechanical reason for failure. The stem aspect of the modular neck/stem junction may be at particular risk.