A Function of the Talocalcaneal Joint during Running Support

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Abstract
This study explored the possible function of the talocalcaneal joint during running support to minimize frontal plane rotation of the leg and thereby protect the knee from excessive frontal plane motions. The lower limb was modeled as two rigid segments representing the foot and the leg. The results indicated that for extreme ground-foot angles the talocalaneal joint was able to maintain the knee in a stable position in the frontal plane. It was concluded that the joint may function to minimize frontal plane rotation of the leg and thereby protect the knee from excessive frontal plane motions. The relevance of this function for a below-the-knee-amputee patient lies in the potential for improved prosthetic design.

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