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目的评价腰椎椎弓峡部裂的ＣＴ表现特征和ＣＴ技术。方法本组包括病例组１７３例（腰椎峡部裂）和对照组２０例（无症状自愿者），均行Ｌ３至Ｓ１椎连续轴向横断层ＣＴ检查。观察每个椎骨连续层面显示骨性结构椎管环的完整性、椎管形态、椎小关节面和椎弓峡部断面形态等。结果病例组１７３例的１７５个椎弓峡部裂椎及对照组中２个腰椎椎弓峡部裂，无一椎显示完整椎管骨性结构环，即呈“环裂征”。病例组３４４个和对照组５８个非椎弓裂椎，除１３个并有脊椎裂的椎骨外，均表现有完整的骨性结构环。结论环裂征是腰椎椎弓峡部裂特征性的ＣＴ表现，对无滑脱腰椎椎弓峡部裂的诊断有重要意义，其敏感性、准确率均为１００％，特异性为９１％。
Objective To evaluate CT features and CT techniques of lumbar spondylolysis. Methods The group consisted of 173 cases (lumbar spondylolysis) and 20 cases (asymptomatic volunteers) in the case group, all underwent axial CT scan from L3 to S1. The continuity of each vertebra was observed to show the integrity of the spinal canal of the bony structure, the morphology of the spinal canal, the facet joint surface and the isthmus of the isthmus. Results There were 173 vertebral isthmic spondylolysis in 173 cases in the case group and two lumbar spondylolysis in the control group. None of the vertebral bodies showed complete spinal canal bony structural ring. 344 cases in the case group and 58 non-vertebral arch fractures in the control group, except for 13 vertebrae with spina bifida, all showed a complete bony structural ring. Conclusions RING is a CT manifestation of lumbar spondylolysis. It is of great importance in the diagnosis of spondylolisthesis without lumbar spondylolisthesis. The sensitivity and accuracy are 100% and 91% respectively.