目的探讨X线、CT和MRI在早期 强直性脊柱炎骶髂关节病变诊断中的应 用价值。方法 从本院2013年9月~2014年 9月收治的早期强直性脊柱炎骶髂关节病 变患者中随机选择100例进行研究，分别 给予X线、CT和MRI检查。观察三种检查方 法的影像表现和分级情况，并进行比较。 结果 MRI诊断的关节面侵蚀和关节面骨质 囊变检出率显著高于X线和 CT诊断，经比 较差异均有统计学意义，(均P＜0.05)； 且MRI诊断的关节软骨肿胀检出率显著高 于X线，经比较差异无统计学意义，(P＞ 0.05)。在0级强直性脊柱炎检出率方面， MRI显著高于X线和 CT诊断，经比较差异 均有统计学意义，(均P＜0.05)；CT和MRI 检查的Ⅰ级、Ⅱ级强直性脊柱炎检出率均 显著高于X线诊断，经比较差异均有统计 学意义，(均P＜0.05)。结论 X线、CT和 MRI在早期强直性脊柱炎骶髂关节病变诊 断中均具有一定的应用价值，其中MRI对 软组织病变以及强直性脊柱炎分级的检出 率更高。

Objective To explore the application value of X-ray, CT and MRI in early ankylosing spondylitis sacroiliac joint lesions in the diagnosis. Methods 100 cases of patients with early sacroiliac joint in ankylosing spondylitis in our hospital from September 2013 to September 2014 were selected, and were given X-ray,CT and MRI examination.The imaging manifestations and classification of the three methods of inspection were observed and compared. Results MRI diagnosis of articular surface erosion and joint bone mass with cystic change detection rate was significantly higher than the CT and X-ray diagnosis, the difference was statistically significant, (all P<0.05); and MRI diagnosis of articular cartilage swelling detection rate was significantly higher than the X-ray, with no significant difference (P>0.05). The detection rate in the 0 stage ankylosing spondylitis, MRI was significantly higher than that of CT and X-ray diagnosis, the difference was statistically significant, (all P<0.05); detection rate of CT and MRI examination of grade I, grade II ankylosing spondylitis were significantly higher than that of X-ray diagnosis, the difference was statistically significant (all P<0.05). Conclusion X-ray, CT and MRI all have certain application value in the early sacroiliac joint in ankylosing spondylitis diagnosis, of which MRI of soft tissue lesions and grading of ankylosing spondylitis higher detection rate.