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目的：探讨ＣＴ检查在强直性脊柱炎（ＡＳ）的早期诊断和随访中的应用。方法：对临床拟诊或可疑ＡＳ病例行双骶髂关节Ｘ线平片及ＣＴ检查，对未分类脊柱关节病和慢作用药治疗３年以上的ＡＳ病人进行ＣＴ随访，并结合临床、实验室资料进行分析。结果：Ⅲ级、Ⅳ级骶髂关节炎在Ｘ线平片和ＣＴ检查符合率较高，而Ⅱ级及Ⅱ级以下者差异较大。３０例未分类脊柱关节病经１０年以上随访，７例发展为ＡＳ。３１例治疗３年以上经ＣＴ随访者中，虽临床和实验室表现均有改善，但ＣＴ表现稳定者不足一半，半数以上ＣＴ表现加重。结论：骶髂关节ＣＴ检查有利于ＡＳ的早期诊断和鉴别诊断，ＣＴ随访为判定ＡＳ疗效的一项重要指征
Objective: To explore the application of CT in the early diagnosis and follow-up of ankylosing spondylitis (AS). Methods: X-ray plain film and CT examination of double sacroiliac joint were performed on suspected or suspected cases of AS. Follow-up CT was performed on patients with unspecific spondyloarthropathies and slow acting drugs for more than 3 years. Combined with clinical and laboratory Data analysis. Results: The grade Ⅲ and Ⅳ sacroiliac arthritis had a high coincidence rate on X-ray and CT examination, while those on grade Ⅱ and Ⅱ were quite different. 30 cases of unclassified spondyloarthropathy were followed up for more than 10 years and 7 cases developed AS. Of the 31 patients who underwent CT for more than 3 years, the performance of clinical and laboratory tests were improved, but the CT performance was less than half, with more than half of CT performed worse. Conclusion: CT examination of sacroiliac joint is good for the early diagnosis and differential diagnosis of AS. CT follow-up is an important indication to judge the effect of AS