寰齿关节退行性变的CT表现及临床分析

Degenerative osteoarthritis of atlanto-odontoid joint:CT findings and clinical analysis

目的描述寰齿（ＡＯ）关节退行性变的ＣＴ表现，统计其临床发病率，探讨ＡＯ关节退行性变与临床症状的关系。方法利用薄层ＣＴ扫描对３１７例接受头颅及下位颈椎ＣＴ检查病人的ＡＯ关节进行前瞻性研究。采用双盲法阅片，主要观察内容：骨质增生性改变，关节间隙的改变，横韧带的改变，记录阳性病人的相关临床症状。结果ＡＯ关节退变的ＣＴ表现主要包括：骨赘形成，关节间隙变窄，横韧带钙化及关节内真空现象。４０岁以上的人群中，ＡＯ关节退行性变的发病率随年龄增大逐渐升高（Ｐ＜０．００１）。结论ＡＯ关节退变在中老人中并不少见。

Purpose To analyze the CT appearances and clinical aspects of the degeneration at atlanto-odontoid(A-O) joint. Methods Thin section axial CT scans, of AO joints were studied in 317 consecutive patients who underwent brain or cervical spine CT examinations.The images were viewed using double-blind method. Observation included:osteophytosis,changes of joint space and transverse ligament, and the clinical symptoms as well. Results CT findings of AO joint degeneration included: formation of osteophyte, narrowing of joint space,transverse ligament calcification,and joint vacuum phenomenon. Among individuals above 40 years of age, the incidence of degeneration at AO joint went up gradually( P <0.01). Conclusion Degeneration of AO joint was not uncommon among aged people,CT could better demonstrate the pathological changes.