Objective: To investigate the therapeutic method of malunion of atlas and axis combined with compressive myelopathy after posterior fusion.

目的：探讨寰枢椎后路融合术后畸形愈合并脊髓压迫症的治疗方法。

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Axial rotation of the lumbar vertebrae occurs around a longitudinal axis that passes through the posterior third of the vertebral bodies and intervertebral discs.

腰椎以一个穿越椎体和椎间盘后三分之一的纵轴为轴进行旋转。

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Result the parameters of posterior arch, lateral mass, vertebral artery groove, axis length of screw pass via posterior arch and lateral mass, projection and direction of screw were measured.

结果测量出寰椎后弓、侧块、椎动脉沟、后弓侧块螺钉通道的轴线长度，及后弓进钉点和进钉方向等参数。

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