目的：比较不同牵引方向对颈椎间盘突出症(PCD)的颈椎形态结构的影响。

Objective the purpose of this study was to compare the functional and morphological changes in the cervical spine with protrusion of cervical disc (PCD) under different directions of traction.

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结论HCD改变了正常椎关节的微细形态结构，对常规牵引方向的规律宜灵活运用。

Conclusion HCD changed the fine morphological structures of normal vertebral joints. The direction of traction should be selected according to condition of the individual case.

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为实现面型改善和理想咬合的统一，需要对颌骨牵引方向进行正畸辅助调控和术后精细咬合调整。

To achieve ideal occlusal relationship and improved surface shape, orthodontic is especially important before and after DO.

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