目的：确定寰齿关节退行性改变与枕颈痛的关系。
Objective: To determine the relationship between atlanto odontoid degeneration and cervico occipital pain.
AA外侧关节退变与枕颈区痛有相关性。
Lateral AA joint degeneration had relation to occipitocervical pain.
结论：1。改进了枕神经阻滞的方法，强调了放散痛对于颈源性头痛的诊断价值，补充了颈源性头痛的诊断标准；
Conclusion:1. Occipital nerve block improved the nerve block method, emphasizing the significance of relieving pain and complement the diagnostic criteria of cervicogenic headache;
结论：1。改进了枕神经阻滞的方法，强调了放散痛对于颈源性头痛的诊断价值，补充了颈源性头痛的诊断标准；
Conclusion:1. Occipital nerve block improved the nerve block method, emphasizing the significance of relieving pain and complement the diagnostic criteria of cervicogenic headache;
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