The piriformis muscles, strong external rotators of the thigh, attach to the sacrum and the femur. Stretching them can increase S-I joint instability.

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。

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Regular U. S. -South Korea joint military exercises, most recently in July, have the same effect.

美韩定期联合军事演习，最近一次是在七月，也有着同样的效果。

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And strengthening the muscles around the S-I joint so as to prevent future problems can be accomplished by practicing simple backbends and standing poses.

要防止疼痛再次打扰，还需要加强骶髂关节周围的肌肉力量，只需要简单的后仰和站立的体式。

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