Subject-specific musculoskeletal model of the lower limb in a lying and standing position

J. Hausselle, A. Assi, A. El Helou, E. Jolivet, H. Pillet, E. Dion, D. Bonneau and W. Skalli

Computer Methods in Biomechanics and Biomedical Engineering, 2014, vol. 17, issue 5, 480-487

Abstract: Accurate estimation of joint loads implies using subject-specific musculoskeletal models. Moreover, as the lines of action of the muscles are dictated by the soft tissues, which are in turn influenced by gravitational forces, we developed a method to build subject-specific models of the lower limb in a functional standing position. Bones and skin envelope were obtained in a standing position, whereas muscles and a set of bony landmarks were obtained from conventional magnetic resonance images in a lying position. These muscles were merged with the subject-specific skeletal model using a nonlinear transformation, taking into account soft tissue movements and gravitational effects. Seven asymptomatic lower limbs were modelled using this method, and results showed realistic deformations. Comparing the subject-specific skeletal model to a scaled reference model rendered differences in terms of muscle length up to 4% and in terms of moment arm for adductor muscles up to 30%. These preliminary findings enlightened the importance of subject-specific modelling in a functional position.

Date: 2014
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DOI: 10.1080/10255842.2012.693173

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