Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
Hum Mov Sci. 2021 Apr;76:102751. doi: 10.1016/j.humov.2020.102751. Epub 2021 Jan 21.
The function of the popliteus muscle [PM] is crucial to knee function. However, it remained unclear in vivo. Thus, this study aimed to explore the PM function in the non-weight-bearing and the weight-bearing conditions in vivo. Fourteen healthy subjects participated in this study. The muscle stiffness of the PM was measured using shear wave elastography as an index of muscle force. Muscle stiffness was measured at 30° knee flexion as a reference value. Muscle stiffness was also measured at passive 0°knee flexion and passive 20° external rotation and internal rotation at 30° knee flexion, and during isometric knee extension, flexion, external rotation, and internal rotation at 30° knee flexion. Moreover, muscle stiffness was measured during one-leg standing at 0° and 30° of knee flexion. Muscle stiffness was significantly greater at passive 0° knee flexion and 20° external rotation and during isometric knee flexion and internal rotation than the reference value. Two-way analysis of variance revealed significant main effects of weight bearing and knee angle: Muscle stiffness increased with weight bearing and knee extension. Moreover, muscle stiffness was significantly lower at 30° than at 0° knee flexion during one-leg standing. The PM function is knee flexion and internal rotation, and the PM force increases with weight bearing and decreases with knee flexion during one-leg standing.
腘绳肌（PM）的功能对膝关节功能至关重要。然而，其在体内的功能仍不清楚。因此，本研究旨在探讨 PM 在非负重和负重条件下的体内功能。14 名健康受试者参与了这项研究。使用剪切波弹性成像测量 PM 的肌肉硬度作为肌肉力量的指标。在 30°膝关节屈曲时测量肌肉硬度作为参考值。还在被动 0°膝关节屈曲和被动 20°外旋和内旋时在 30°膝关节屈曲时以及在等长膝关节伸展、屈曲、外旋和内旋时测量肌肉硬度。此外，在 0°和 30°膝关节屈曲的单腿站立时测量肌肉硬度。与参考值相比，被动 0°膝关节屈曲和 20°外旋以及等长膝关节屈曲和内旋时的肌肉硬度显着更大。双因素方差分析显示，负重和膝关节角度有显著的主要影响：肌肉硬度随负重和膝关节伸展而增加。此外，单腿站立时，30°时的肌肉硬度显着低于 0°时的肌肉硬度。PM 的功能是膝关节屈曲和内旋，PM 的力随负重增加而增加，随单腿站立时膝关节屈曲而减小。
