The piriformis muscles, strong external rotators of the thigh, attach to the sacrum and the femur. Stretching them can increase S-I jointinstability.
梨状肌是附着在骶骨和大腿骨上的强大的回旋肌，对他们的拉伸有损于骶髂关节的稳定性。
2
The article reviews the function of proprioception in maintaining joint stability and the proprioceptive loss and reconstruction of functional jointinstability.
本文综述本体感觉在维持关节稳定性方面的作用，以及功能性关节不稳的本体感觉变化和重建的意义。
3
The right knee pain upon sudden standing up from sitting position is due to the instabilityof the knee joint most likely resulted from weaken muscle power around the knee.