Poor rotation, low swinging arms and cross-overs are the major causes of shoulder injury.

不好的身体滚动，低摆臂和过中线是造成肩伤的主要原因。

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Conclusions: We concluded that the expandable IM femoral nail, when tested in purely axial rotation, has poor rotational stability compared with the standard locked IM femoral nail.

结论：我们认为当单纯进行轴向旋转测试时，和标准的锁定股骨髓内钉相比，膨胀股骨髓内钉的抗旋转稳定性差。

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Conclusions: We concluded that the expandable IM femoral nail, when tested in purely axial rotation, has poor rotational stability compared with the standard locked IM femoral nail.

结论：我们认为当单纯进行轴向旋转测试时，和标准的锁定股骨髓内钉相比，膨胀股骨髓内钉的抗旋转稳定性差。

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