Methods The atlantoaxial vertebrae of 30 normal subject, 5 fresh corpse specimen and 16 cases of AARF were scanned by spiral CT in function position respectively.

• 方法分别对正常组30例、寰枢关节旋转固定患者组16例、新鲜尸体标本组5例行头部功能位CT扫描，测量并比较各组的寰齿前间隙、寰齿侧间隙及寰枢椎相对旋转角的变化。