之后，双踝关节周围的皮肤开始变黑、变硬。
After that, the skin around the ankles turned black and hardened.
反之，关节周围的感染所造成的骨破坏，也是关节松动下沉的一个原因。
On the contrary, the destruction of bone around the joint caused by infection is one of the reasons of joint sinking.
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。
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.
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