Créé le : 17/04/2015
Bah MT, Shi J., Heller MO, Suchier Y., Lefebvre F., Young P., King L., Dunlop DG, Boettcher M., Draper E., Browne M. - 2014 - Conférence World congress of biomechanic…
Shorter femoral stems are thought to conserve bone and aid in soft tissue sparing, resulting in improved function, but might not suit all patients due to the reduced area of bone available for implant fixation. With the aim to explore the need for patient stratification in the use of short stems, the present study explores the primary stability of a titanium alloy cementless femoral stem (FURLONG® EVOLUTION, JRI Orthopaedics Ltd, UK) across the spectrum of femoral morphology. CT-scan based femur models (75 male and 34 female, 43-106 years, voxel size: 0.488x0.488x1.5mm-0.7422x0.7422x0.97mm) were virtually implanted with 12 stems: 2 offsets, 2 CCD angles and 5 stem sizes. Here, the optimal implant configuration (CCD-angle, femoral offset) and size were automatically selected to best approximate the 3D morphology of each femur. The implant that matched most femurs was the low offset 126°-CCD angle stem, size 13 (36 males and 20 females). Finite Element debonded contact models (coefficient of friction: 0.4; with and without 50μm interference-fit) used physiological displacement constraints [1] and peak joint/muscle forces during walking (HIP98 data, www.orthoload.com) to determine bone-implant interface mechanics.
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Fabien Lefebvre
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