The effect of knee joint moment on change of ankle joint angle

Abstract

The purpose of this study is to find how the act of two-joint muscles effect to another joint so that knee extension and flexion moment measured with changing knee and ankle angles. The developed isometric moment were measured under the three patterns of the ankle with plantarflexion, dosiflexion and free position.

The results obtained as follows ;

(1) Knee extension moment showed higher value at free position, and it showed significantly higher value for dorsiflex position in knee joint angle was 130deg, 140deg, respectively.

(2) Knee flex moment showed higher value at 140deg of knee joint angle in all ankle patterns. When knee joint angle was 110, 120deg, free position was significantly higher value for plantarflex position.

(3) When it was not constrained ankle position, gastrocnemius and rectus femoris were to be synagist muscles for knee extension movement.

(4) It was desirable that ankle joint position was to fix dorsiflex than anatomical position like a one-joint muscle in knee flexion movement, It seems to be more advantageous in the mechanics of musculoskeletal system.