Relationships between Hamstring Muscle Activation and Valgus Knee Angle in Single-Leg Jump Landing

AKIMOTO Takeshi, URABE Yukio, ICHIKI Yasutoshi, IDE Kazushige

doi:10.1589/rika.24.137

[Purpose] In response to loading of the femur, the lower leg outwardly rotates, thereby inducing "knee-in". Through this lower leg outward rotation, knee-in, induces valgus of the knee joint. The objective of this study was to clarify the relationships of the muscle activities of the hamstring, which is a rotator muscle, and the vastus medialis and vastus lateralis muscles which contribute to the lateral stability of the knee, at the time of one-leg jump landing. [Subjects] The subjects were 27 healthy female university students with no medical history of knee disease or injury. [Method] The activities of the vastus medialis (VM), vastus lateralis (VL), semimembranosus (SM) and biceps femoris (BF) were derived from electromyography (EMG) and the maximum valgus knee angle was calculated. [Results] A significant positive correlation (p<0.05, r=0.40) was found between the ratio, BF:SM (the ratio of the activities of the medial and lateral hamstring muscles) and the maximum valgus knee angle. [Conclusion] The results suggest that at the time of one-leg jump landing, the valgus knee angle will be large for persons with a high BF:SM ratio.<br>

Relationships between Hamstring Muscle Activation and Valgus Knee Angle in Single-Leg Jump Landing

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