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204 results on '"Follet H"'

1. comparison of two models to predict vertebral failure loads on the same experimental dataset

Author

Allard, V., Heidsieck, C., Bermond, F., Confavreux, C., Travert, C., Gajny, L., Skalli, W., Mitton, D., and Follet, H.

Subjects
Mathematics - Numerical Analysis
Abstract

Clinical use of finite element analysis requires validation and reproducibility studies. The current study compared two models of vertebral bodies including endplates, on the same experimental dataset and evaluated the influence of the operator on the failure load. Models used were strongly correlated (R2=0.91). The intra-operator reproducibility was 6.4% and 3.5 % for each model. Both simulated results were close to experimental results. The differences in performance could be associated to the differences in segmentation process, mesh (hexahedral vs tetrahedral), material representation and failure criteria. Linear analysis did not decrease model accuracy. Comparison with literature for accuracy and precision shows a wide range of values partly related to the different experimental datasets and the different modelling approaches. Models benchmark using the same experimental dataset are needed to go towards clinical applications., Comment: 5 pages, 4 figures, 2 tables

Published
2024

14. Relevant Existing Practices

Author

Avino, D., Becchini, R., Chilaev, P., Follet, H., Krivtsov, V., Martelli, A., Volochinov, V., Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Drira, Khalil, editor, Villemur, Thierry, editor, and Martelli, Andrea, editor

Published
2001
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29. Anisotropic properties of children’s cortical bone measured by ultrasonic method

Author

Lefèvre, E., Payan, C., Baron, C., Launay, F., Lasaygues, P., Follet, H., Martine Pithioux, Institut des Sciences du Mouvement Etienne Jules Marey (ISM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Ondes et Imagerie (O&I), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and Payan, Cedric

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

32. Caractérisation du tissu osseux humain par nanoindentation

Author

Crozier, P., Sylvain Meille, Clément, P., Thierry Douillard, Hadjab, I., Follet, H., Jérome Chevalier, Boivin, G., Mateis, Laboratoire, Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Physiopathologie, diagnostic et traitements des maladies osseuses / Pathophysiology, Diagnosis & Treatments of Bone Diseases (LYOS), and Université de Lyon-Université de Lyon-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Abstract

International audience; no abstract

Published
2012

38. Clinical cone beam computed tomography compared to high-resolution peripheral computed tomography in the assessment of distal radius bone.

Author

Charry, C., Boutroy, S., Ellouz, R., Duboeuf, F., Chapurlat, R., Follet, H., and Pialat, J.

Subjects
COMPUTED tomography, STATISTICAL correlation, RADIAL bone
Abstract

Summary: Clinical cone beam computed tomography (CBCT) was compared to high-resolution peripheral quantitative computed tomography (HR-pQCT) for the assessment of ex vivo radii. Strong correlations were found for geometry, volumetric density, and trabecular structure. Using CBCT, bone architecture assessment was feasible but compared to HR-pQCT, trabecular parameters were overestimated whereas cortical ones were underestimated. Introduction: HR-pQCT is the most widely used technique to assess bone microarchitecture in vivo. Yet, this technology has been only applicable at peripheral sites, in only few research centers. Clinical CBCT is more widely available but quantitative assessment of the bone structure is usually not performed. We aimed to compare the assessment of bone structure with CBCT (NewTom 5G, QR, Verona, Italy) and HR-pQCT (XtremeCT, Scanco Medical AG, Brüttisellen, Switzerland). Methods: Twenty-four distal radius specimens were scanned with these two devices with a reconstructed voxel size of 75 μm for Newtom 5G and 82 μm for XtremeCT, respectively. A rescaling-registration scheme was used to define the common volume of interest. Cortical and trabecular compartments were separated using a semiautomated double contouring method. Density and microstructure were assessed with the HR-pQCT software on both modality images. Results: Strong correlations were found for geometry parameters ( r = 0.98-0.99), volumetric density ( r = 0.91-0.99), and trabecular structure ( r = 0.94-0.99), all p < 0.001. Correlations were lower for cortical microstructure ( r = 0.80-0.89), p < 0.001. However, absolute differences were observed between modalities for all parameters, with an overestimation of the trabecular structure (trabecular number, 1.62 ± 0.37 vs. 1.47 ± 0.36 mm) and an underestimation of the cortical microstructure (cortical porosity, 3.3 ± 1.3 vs. 4.4 ± 1.4 %) assessed on CBCT images compared to HR-pQCT images. Conclusions: Clinical CBCT devices are able to analyze large portions of distal bones with good spatial resolution and limited irradiation. However, compared to dedicated HR-pQCT, the assessment of microarchitecture by NewTom 5G dental CBCT showed some discrepancies, for density measurements mainly. Further technical developments are required to reach optimal assessment of bone characteristics. [ABSTRACT FROM AUTHOR]

Published
2016
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49. Compressive strength of human openwedges: a selection method

Author

Follet, H., Gotteland, M., Bardonnet, R., Sfarghiu, A.M., Peyrot, J., and Rumelhart, C.

Abstract

A series of 44 samples of bone wedges of human origin, intended for allograft openwedge osteotomy and obtained without particular precautions during hip arthroplasty were re-examined. After viral inactivity chemical treatment, lyophilisation and radio-sterilisation (intended to produce optimal health safety), the compressive strength, independent of age, sex and the height of the sample (or angle of cut), proved to be too widely dispersed [ $10{-}158$ MPa] in the first study. We propose a method for selecting samples which takes into account their geometry (width, length, thicknesses, cortical surface area). Statistical methods (Principal Components Analysis PCA, Hierarchical Cluster Analysis, Multilinear regression) allowed final selection of 29 samples having a mean compressive strength $\sigma_{max} =103~{\rm MPa} \pm 26$ and with variation [ $61{-}158$ MPa] . These results are equivalent or greater than average materials currently used in openwedge osteotomy.

Published
2004

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