Title: Muscle optimization techniques impact the magnitude of calculated hip joint contact forces
Authors: Wesseling, Mariska * ×
Derikx, Loes C *
De Groote, Friedl
Bartels, Ward
Meyer, Christophe
Verdonschot, Nico
Jonkers, Ilse #
Issue Date: Mar-2015
Publisher: Elsevier Science
Series Title: Journal of Orthopaedic Research vol:33 issue:3 pages:430-8
Article number: 10.1002/jor.22769
Abstract: In musculoskeletal modelling, several optimization techniques are used to calculate muscle forces, which strongly influence resultant hip contact forces (HCF). The goal of this study was to calculate muscle forces using four different optimization techniques, i.e., two different static optimization techniques, computed muscle control (CMC) and the physiological inverse approach (PIA). We investigated their subsequent effects on HCFs during gait and sit to stand and found that at the first peak in gait at 15-20% of the gait cycle, CMC calculated the highest HCFs (median 3.9 times peak GRF (pGRF)). When comparing calculated HCFs to experimental HCFs reported in literature, the former were up to 238% larger. Both static optimization techniques produced lower HCFs (median 3.0 and 3.1 pGRF), while PIA included muscle dynamics without an excessive increase in HCF (median 3.2 pGRF). The increased HCFs in CMC were potentially caused by higher muscle forces resulting from co-contraction of agonists and antagonists around the hip. Alternatively, these higher HCFs may be caused by the slightly poorer tracking of the net joint moment by the muscle moments calculated by CMC. We conclude that the use of different optimization techniques affects calculated HCFs, and static optimization approached experimental values best. © 2014 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.
ISSN: 0736-0266
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Human Movement Biomechanics Research Group
Production Engineering, Machine Design and Automation (PMA) Section
Biomechanics Section
Research Group for Neuromotor Rehabilitation
* (joint) first author
× corresponding author
# (joint) last author

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