目的 总结成人髋臼发育不良 (acetabular dysplasia,AD)继发骨关节 炎(osteoarthritis,OA)的影像学特点， 分析不同检查方法诊断成人髋臼发育不良 继发关节炎的临床价值。方法 收集2013 年1月-2015年10月我院收治的300例髋臼 发育不良患者的影像学资料，所有患者均 已接受X线片检查，127例接受CT扫描，48 例接受MRI检查，所有图像均传输至工作 站，按有无继发骨关节炎分为两组，比较 两组影像学表现差异，分析不同影像学手 段诊断成人髋臼发育不良继发骨关节炎的 临床价值。结果 300例AD中继发OA 82例 (27.33%)；继发组CE角、髋顶切线角、髋 臼指数、股骨头覆盖率、髋关节上间隙均 低于无继发组(P<0.05)，其Sharp角、髋 关节内侧间隙高于无继发组(P<0.05)； MRI对AD继发OA检出率最高，与CT、X线诊 断对比差异有统计学意义(P<0.05)，同时 CT检出率高于X线(P<0.05)。结论 MRI可 检出成人AD并OA患者软骨下小囊变、关节 软骨退变，对成人AD伴周围骨囊变检出率 优于X线与CT诊断。

Objective To summarize the imaging findings of osteoarthritis (OA) secondary to acetabular dysplasia (AD) in adults, and to analyze the clinical value of different examination methods in the diagnosis of the disease. Methods The imaging data of 300 cases of patients with AD who were admitted in our hospital between January 2013 and October 2015 were collected. All the patients were examined by X-ray. One hundred and twenty-seven patients underwent CT scan and 48 patients underwent MRI examination. All images were transferred to the workstation. According to whether there was secondary OA, they were divided into two groups. The imaging findings were compared between the two groups. The clinical value of different imaging methods in the diagnosis of OA secondary to AD was analyzed. Results In 300 patients with AD, 82 patients (27.33%) were with secondary OA. The CE angle, hip top angle of contingence, acetabular index, coverage of femoral head and space on hip joint of the secondary group were lower than those of non-secondary group (P<0.05). The Sharp angle and inner space of hip joint were higher than those of the non-secondary group (P<0.05). The detection rate of MRI for OA secondary to AD was the highest. Compared with that of CT and X-ray, the differences were significant (P<0.05). Besides, the detection rate of CT was higher than that of X-ray (P<0.05). Conclusion MRI can detect subchondral utricular lesions and articular cartilage degeneration in adults with AD and OA. The detection rate in the diagnosis of adults with AD and surrounding bone cysts is better than that of X-ray and CT.