本文旨在研究环枢关节侧向滑脱患者前后位的张口位Ｘ线片。探讨环枢关节侧向滑脱的Ｘ线诊断。在环枢关节的张口位Ｘ线片中 ,以环椎侧块两外下角与枢椎外侧缘是否整齐对称和枢椎齿突是否位于颈椎棘突连线之延长线上来确定病例共 2 0 0例。作环枢关节两侧块内缘中点之连线 ,测量 This paper aims to study the anterior and posterior position of X-ray films of patients with lateral spondylolisthesis. To investigate the X-ray diagnosis of lateral slipping of the pivot joints. In the mouth of the pivot joint X-ray film, to the lateral vertebral lateral block lateral angle and the lateral symmetry of the lateral axis and whether the axonal spinous process is located in cervical spinous process extension line to determine the total number of cases 2 0 0 example. Central pivot joints on both sides of the inner edge of the midpoint of the connection, measurement