目的 :应用螺旋CT定量分析儿童髋关节发育不全 (DDH)Salter手术前后髋关节的变化。材料和方法 :临床及骨盆平片诊断为DDH并行Salter手术的患儿25名 ,比较其术前及术后半年股骨颈前倾角、髋臼前倾角及轴向髋臼指数等CT资料 ,并经统计学检验。结果 :应用SAS配对t检验 ,手术前后股骨颈前倾角差值有显著意义 ,髋臼前倾角差值有明显的显著意义 ,轴向髋臼指数无显著意义。结论 :CT能定量显示DDH患髋手术前后的变化情况 ,为观察手术疗效提供了切实的依据。 Objective: To quantitatively analyze the changes of hip joint before and after salter operation in children with hip hypoplasia (DDH) by spiral CT. Materials and Methods: Twenty-five children diagnosed as DDH and Salter operation by pelvic plain radiography were included in this study. The CT data of femoral neck anteversion, acetabular anteversion and axial acetabular index were compared before and after surgery. Statistical test. Results: SAS paired t-test showed significant difference in anteroposterior femoral neck angle before and after operation, with significant difference in acetabular anterior-posterior angle and no significant difference in axial acetabular index. Conclusion: CT can quantitatively show the changes of hip in patients with DDH before and after operation, providing a solid foundation for observing the effect of surgery.