Abstract
[Purpose] The purpose of this study was to analyze the knee motion during side-jump landing. [Subjects] Eleven healthy females participated in this study. [Methods] The subjects performed a side-jump of 80% of their height from the starting position. They were instructed to jump at least 30 cm in height, and to keep the separation of both feet to 30% of their height. The ground reaction force (GRF) from the time when it extended 10 N to the time when the knee flexion angle reached its maximum during the side-jump landing was recorded. [Results] The right knee flexion angle at the landing and at maximum knee flexion were both significantly smaller than the left. The valgus angle was significantly greater at the ground contact. [Conclusion] The right knee joint flexion angle at the landing was significantly smaller and the valgus angle was significantly greater than those of the left. Therefore, the results suggest that the right knee may suffer anterior cruciate ligament injury.
