Conclusions Besides the injury of the radial collateral ligament, the injuries of the external musculus extensor and the aponeurosis can cause the posterolateral rotatory instability of the elbow.

• 结论肘关节后外侧旋转不稳定除桡侧副韧带的损伤外，可能还有外侧伸肌及伸肌腱膜的损伤。