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目的：探讨ＣＴ在小儿髋关节发育不良（ＤＤＨ）中的应用价值及方法。材料与方法：１９９６年至今经临床和Ｘ线诊断为ＤＤＨ的患儿４０例行ＣＴ扫描。男性３例，女性３７例。男女之比约１∶１２。年龄５个月～９岁，平均３．１岁。采用特制的足板和检查鞋，行髋臼、股骨头及股骨髁ＣＴ扫描。在软组织窗位和骨窗位观察髋臼及股骨头的发育，并进行股骨颈前倾角的测量。结果：完全性脱位２８例，占７０％，不完全性脱位１２例，占３０％。表现为髋臼、股骨头发育不良，髋关节间隙增宽、空虚，患侧髋关节腔内脂肪密度影填充５８侧（１００％）。３３例显示髂腰肌肌腱内陷，关节囊折叠，占５７％。其中以完全性脱位者为主（２４／３３）。股骨颈前倾角明显增大。结论：ＣＴ的横断面及高分辨率特性使之为临床ＤＤＨ的诊治提供了大量宝贵的信息，并为闭式复位和手术患者的疗效观察及随访提供了客观依据
Objective: To investigate the value and method of CT in pediatric hip dysplasia (DDH). MATERIALS AND METHODS: Forty patients with DDH diagnosed clinically and X-ray since 1996 were underwent CT scan. 3 males and 37 females. The ratio of men and women is about 1:12. Aged 5 months to 9 years old, with an average of 3.1 years old. Using a special foot board and check shoes, line acetabular, femoral head and femoral condyle CT scan. Observe the development of acetabulum and femoral head in soft tissue window and bone window, and measure femoral neck anteversion. Results: Complete dislocation in 28 cases, accounting for 70%, incomplete dislocation in 12 cases, accounting for 30%. The performance of the acetabulum, femoral head dysplasia, hip gap widened, emptiness, ipsilateral hip cavity fat density shadow filling 58 side (100%). 33 cases showed iliopsoas tendon retraction, joint capsule folded, accounting for 57%. Among them are those who are completely dislocated (24/33). Femoral neck anteversion increased significantly. Conclusion: The cross-sectional and high-resolution features of CT provide a great deal of valuable information for the diagnosis and treatment of clinical DDH, and provide an objective basis for the clinical observation and follow-up of closed reduction and surgical patients