目的对创伤性肩关节后方不稳定关节镜下表现与MR关节造影（MRA）的影像进行对比分析。

Objective To compare the finding between arthroscopy and MR- arthrogram(MRA)in the patients with traumatic posterior shoulder instability.

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这些症状表明不稳定的骶髂关节发生了脱位，然后又自行复位。

These are some of the symptoms of an unstable sacroiliac joint alternately moving out of alignment and back in again.

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膝关节是相对不稳定的，因为没有共同联锁骨骼的研究。

The knee joint is relatively unstable because there is no interlocking of bones in the joint.

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