Title: Subject-specific hip geometry affects predicted hip joint contact forces during gait
Authors: Lenaerts, Gerlinde ×
De Groote, Friedl
Demeulenaere, Bram
Mulier, Michiel
Van der Perre, Georges
Spaepen, A.
Jonkers, Ilse #
Issue Date: Jun-2008
Publisher: Pergamon Press
Series Title: Journal of Biomechanics vol:41 issue:6 pages:1243-1252
Abstract: Hip loading affects bone remodeling and implant fixation. In this study, we have analyzed the effect of subject-specific modeling of hip geometry on muscle activation patterns and hip contact forces during gait, using musculoskeletal modeling, inverse dynamic analysis and static optimization. We first used sensitivity analysis to analyze the effect of isolated changes in femoral neck-length (NL) and neck-shaft angle (NSA) on calculated muscle activations and hip contact force during the stance phase of gait. A deformable generic musculoskeletal model was adjusted incrementally to adopt a physiological range of NL and NSA. In a second similar analysis, we adjusted hip geometry to the measurements from digitized radiographs of 20 subjects with primary hip osteoarthrosis. Finally, we studied the effect of hip abductor weakness on muscle activation patterns and hip contact force. This analysis showed that differences in NL (41-74 mm) and NSA (113-140 degrees ) affect the muscle activation of the hip abductors during stance phase and hence hip contact force by up to three times body weight. In conclusion, the results from both the sensitivity and subject-specific analysis showed that at the moment of peak contact force, altered NSA has only a minor effect on the loading configuration of the hip. Increased NL, however, results in an increase of the three hip contact-force components and a reduced vertical loading. The results of these analyses are essential to understand modified hip joint loading, and for planning hip surgery for patients with osteoarthrosis.
ISSN: 0021-9290
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Orthopaedics Section (-)
Movement Control & Neuroplasticity Research Group
Production Engineering, Machine Design and Automation (PMA) Section
Biomechanics Section
× corresponding author
# (joint) last author

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