A musculoskeletal model was used to study tendon transfer surgery in order to decouple hip extension and knee flexion in lower extremity FNS applications. Effects of tendon transfer location and shortening length were quantitatively examined based on the resulting moment-generating capacity. Simulation results have shown that moment arm is not sensitive to the transfer locations. Appropriate shortening is the key to counteract the tendon slack caused by the transplantation and to achieve maximal hip extension strength.

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