目的评价与分析MRI与CT诊断 强直性脊柱炎骶骼关节病变临床效果。 方法 选取本院78例强直性脊柱炎患者分 别采用MRI和CT进行扫描检查，根据本次 检查结果来判断患者病变程度，同时与 临床骨质异常检出率进行比较与分析。 结果 采用MRI检查I级强直性脊柱炎骶骼 病变敏感性为33.33%(26/78)明显高于CT 检查17.95%(14/78)(P<0.05)，对于II级 以上病变采用MRI与CT检查则无统计学意 义(P>0.05)。CT检出骨质异常率明显高 于MRI检出率(P<0.05)。结论 相对MRI来 说，采用CT扫描检查具有更高分辨率，其 可有效诊断强直性骶骼关节病变，而采用 MRI检查可更好的显示关节软骨异常和脂 肪沉积等病变，一般用于诊断早期强直性 脊柱炎骶骼关节病变患者，为临床及早发 现和诊断及治疗强直性脊柱炎骶骼关节病 变提供一定参考依据。

Objective To evaluate and analyze the clinical value of MRI and CT in the diagnosis of sacroiliac joint lesions of ankylosing spondylitis. Methods 78 cases with ankylosing spondylitis underwent MRI and CT scanning to judge the degree of lesions, and the results were compared to the clinical bone abnormality rate. Results The sensibility of MRI to examine sacroiliac lesions of ankylosing spondylitis I were 33.33% (26/78), which was significantly higher than CT 17.95% (14/78) (P<0.05). There was no statistical significance (P>0.05) to diagnose sacroiliac lesions of severer than ankylosing spondylitis II by MRI and CT. The detectable rate of bone abnormality of CT was significantly higher than MRI (P<0.05). Conclusion Compared with MRI, CT has a higher resolution, which can effectively diagnose sacroiliac joint lesions. Articular cartilage abnormalities and fat deposition can be showed clearly by MRI, and MRI is always used in the early diagnosis of sacroiliac joint lesions of ankylosing spondylitis and to provide basis for the the early diagnosis and treatment of sacroiliac joint lesions of ankylosing spondylitis.