目的　探讨三维 CT重建在先天性髋关节脱位(CDH)的临床应用 .方法　本组 CDH患儿 2 2例 ,其中双髋脱位 1 5例 ,单髋脱位 7例 ,另有正常髋 2例 ,共计患髋 37个 ,正常对照髋 1 1个 .采用 Picker公司 PQ60 0 0螺旋 CT机 ,在独立工作站进行表面遮盖成像 (SSD)、最大密度投影 (MIP)、多平面重建 (MPR)和相关数据测量 .结果　分别对股骨头颈、髋臼及头臼关系行三维直观显示 ,运用 MPR技术测量了髋臼指数 (AI)和股骨颈前倾角 (FNA ) :AI正常组平均值(1 7.6± 4.8)°,异常组平均值 (35.4± 9.5)°,FNA正常组平均值 (2 2 .5± 7.1 )°,异常组平均值 (38.0± 1 0 .7)°.结论　三维CT可以直观、全面及分解地显示髋关节结构 ,对于股骨头、髋臼形态和头臼关系的显示以及精确的相关测量具有优势 ,为手术方案的制定提供了新的客观依据 Objective To investigate the clinical application of three-dimensional CT reconstruction in the treatment of congenital dislocation of the hip (CDH) .Methods Totally 22 patients with CDH were enrolled in this study, including 15 cases of double-hip dislocation, 7 cases of single hip dislocation and 2 cases of normal hip. 37 affected hips and 1 of the normal control hips SSD, MIP, MPR and related data measurements were performed on a standalone workstation using a Picker PQ60 0 0 CT scanner .Results Three-dimensional visualization of the relationship between femoral neck, acetabulum and acetabulum respectively was performed. The acetabular index (AI) and femoral neck anteversion (FNA) were measured by MPR technique. The average value of AI normal group (1 7.6 ± 4.8) ° , Mean abnormal group (35.4 ± 9.5) °, average normal group (22.5 ± 7.1) ° and abnormal group (38.0 ± 1.07) ° .Conclusion Three-dimensional CT can be intuitive, comprehensive and decomposed Shows the structure of the hip joint and has advantages for the display of the relationship between the femoral head and the acetabulum and the acetabular head as well as the accurate correlation measurement so as to provide a new objective basis for the formulation of the surgical plan