目的 比较分析CT与MRI平扫在诊 断强直性脊柱炎骶骼关节病变中的应用情 况。方法 收集近3年来我院门诊和住院部 接受治疗的强直性脊柱炎骶髂关节病变患 者60例，分别使用CT和MRI进行检查，对 检查结果进行分级对比。结果 MRI对于强 直性脊柱炎的早期诊断效果要高于CT，P ＜0.05；而在强直性脊柱炎≥II级的结果 对比中无明显差异，P＞0.05。CT对于骨 质侵蚀和骨质硬化的检出效果优于MRI，P ＜0.05。结论 MRI对于强直性脊柱炎的早 期诊断效果高于CT，CT对于骨质侵蚀和骨 质硬化的检出效果优于MRI，二者互补， CT与MRI联合对于强直性脊柱炎骶髂关节 病变早期诊断具有重大的意义。

Objective To compare the clinical value of CT and MRI plain scan in detection of abnormal sacroiliac joint changes in patients with ankylosing spondylitis(AS). Methods The CT and MRI data of 60 cases of AS which undergoing treatment in the past three years were analyzed and compared retrospectively. Results The diagnostic effect of MRI for the early stage of AS is higher than that of CT, P＜0.05. The diagnostic effect of MRI and CT had no obvious difference in grade 2 or more serious cases, (P＞0.05). The detection effect of CT is higher than MRI in cases with bone erosion and bone hardening,P＜0.05. Conclusion The diagnostic effect of MRI is higher than that of CT in early stage of ankylosing spondylitis, CT is more sensitive in detecting bone erosion and bone hardening than MRI. The combination of CT and MRI in abnormal sacroiliac joint changes in patients with AS is of great significance.