【摘要】 目的 分析骶髂关节特殊CT征象及临床意义。 方法 分析近两年86例患者的正常骶髂关节CT资料。采用倾角度扫描方法获取关节纵断面完整图像，观察两侧关节形态差异、个体形态差异，分析其特殊CT表现。 结果 4例13～16岁少年骶髂关节间隙宽而平直，骶侧关节面不规则。成人骶髂关节呈凹凸状交互崁合，两侧关节无镜像对称，个体间形态差异大。关节边缘局部不规则或粗糙结节样改变24例（27.9%），可见不同程度的骨质增生47例（54.7%），关节狭窄32例（37.2%），关节积气61例（70.9%）。 结论 骶髂关节边缘不规则，骨质硬化，关节间隙不对称或狭窄，关节积气等表现可见于正常骶髂关节。【Abstract】 Objective To analyze the specific CT signs of sacroiliac joint and its clinical significance. Methods CT scanning with tilt angle was performed in 86 patients of normal sacroiliac joint. The morphological differences and specific CT manifestations were analysed on both sides of the joints and different individuals. Results In four patients from 13 to 16 years old, the sacroiliac joints space were straight and in normal range of width, and the sacral articular surface was irregular. The sacroiliac joints in adults were bump-like. Both sides of the joint were not completely symmetrical, and individual difference was large. The partial articular edge in 24 patients (27.9%) was irregular, rough or nodular. Other special signs of the joints include cortical hyperplasia in 47 patients (54.7%), stenosis in 32 patients (37.2%) and intra-articular gas in 61 patients (70.9%). Conclusion Irregular articular edge, bone sclerosis, asymmetric joint space or stenosis and intra-articular gas could be seen in the normal sacroiliac joint.