目的 观察强直性脊柱炎(AS)骶 髂关节病变患者CT影像学表现，分析其与 病理特征的关系。方法 回顾性分析76例 AS骶髂关节病变患者的临床资料。患者均 接受X线、CT检查。比较X线与CT对AS骶骼 关节病变分级诊断情况差异。观察AS骶髂 关节病变患者CT影像学表现，分析其与病 理特征的关系。结果 CT确诊Ⅱ、Ⅲ级AS 骶骼关节病变例数高于X线(P＜0.05)。CT 检查显示AS骶骼关节病变以累及双侧、骼 骨关节面、滑膜部为主。AS骶骼关节病变 常见关节软骨钙化、关节间隙改变、关节 面下骨质硬化、骶骼韧带钙化等改变，CT 表现均可明确反映。结论 CT用于AS骶骼 关节病变有助于提升检出率，CT表现可准 确反映AS骶骼关节病变不同病理特征，为 该疾病诊断治疗提供帮助。

Objective To observe the CT imaging findings of patients with sacroiliac joint lesions of ankylosing spondylitis (AS) and analyze their relationship with pathological features. Methods The clinical data of 76 patients with sacroiliac joint lesions of AS were retrospectively analyzed. All patients were given X-ray and CT examination. The grades diagnosis of AS sacroiliac joint lesions was compared between X-ray and CT. The CT imaging findings of patients with AS sacroiliac joint lesions were observed, and their relationship with pathological features was analyzed. Results The number of cases of grades II and III AS sacroiliac joint lesions by CT was higher than that by X-ray (P<0.05). CT examination showed that the AS sacroiliac joint lesions mainly affected bilateral side, iliac articular surface and synovial membrane. Common changes of AS sacroiliac joint lesions were articular cartilage calcification, joint space changes, sub-articular osteosclerosis and sacroiliac ligament calcification, and the changes could be clearly reflected by CT findings. Conclusion CT for AS sacroiliac joint lesions helps to improve the detection rate. CT findings can accurately reflect the different pathological features of AS sacroiliac joint lesions and provide assistance for diagnosis and treatment of this disease.