Loads on Lower Limb Joints and Optimal Action of Muscles for Shock Reduction

概要

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In this paper, a new method has been proposed to theoretically analyze the forces on the toe, ankle and knee joints using a musculoskeletal model of the lower limb. It was shown that when a human being jumps down vertically from a height of 0.3 meters without an active shock absorbing motion, the maximum force on the knee joint could reach up to 11.2 times his weight. Moreover, the optimal motion of the lower limb muscles during a vertical landing on a hard surface was obtained by converting the multi-degree-of-freedom and nonlinear optimal control problem to a parameter optimization problem. Detailed investigations were performed in three cases to minimize the forces on the toe, the ankle and the knee joints. By this optimal motion, it is possible to reduce the forces on the toe and the lower limb joints by half. It was determined that the forces on the toe would be involved in the performance function. Furthermore, the forces on the toe and the activation level of the lower limb muscles predicted by parameter optimization agreed well with the experimental results.
一般社団法人日本機械学会の論文
1999-09-15