关键词: 髋臼发育不良, 髋臼深度角, Sharp角

Abstract:

Objective To identify alternative diagnostic indicators for adult developmental dysplasia of the hip （DDH） and establish a radiographically?based combinatorial evaluation method when the center?edge （CE） angle is unmeasurable. Methods This retrospective case?control study included 59 DDH patients （101 hips） and 33 controls （66 hips）. Radiographic parameters?the CE angle， acetabular roof angle （ACM angle）， Sharp angle， acetabular roof obliquity （ARO）， and neck?shaft angle （NSA）?were measured. Binary logistic regression identified independent predictors， and receiver operating characteristic （ROC） analysis determined optimal thresholds. A diagnostic model was implemented as a desktop application. Results Developmental dysplasia of the hip exhibited significant differences in acetabular roof obliquity， ACM angle， Sharp angle， and NSA （P < 0.05）. The ACM angle （OR = 0.297， 95% CI： 0.152 - 0.579） and Sharp angle （OR = 2.964， 95% CI： 1.577 - 5.572） were identified as independent predictors. The combined model achieved an area under the curve （AUC） of 0.995 （95% CI： 0.989 - 1.000）， surpassing individual parameters （P < 0.05）， with a cutoff value of 0.760 （98.1% sensitivity， 95.5% specificity）. Conclusion The ACM?Sharp angle model effectively diagnoses developmental dysplasia of the hip with high clinical utility. Integrated software facilitates implementation.

Key words: developmental dysplasia of the hip, acetabular center?margin angle, sharp angle