Since joint contact forces can be measured using instrumented implants, they can be used to validate musculo-tendon and contact forces predicted by simulation. We propose in this study a new approach that introduces contact forces minimization in the musculo-tendon forces optimization during gait. We show that using a numerical trick, it can be possible to compute in a one-level optimization both musculo-tendon and contact forces. Moreover we show that taking into account contact forces in the optimization has a real impact on musculo-tendon forces computation.

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