Acetabular depth angle and sharp angle were used to diagnose adult acetabular dysplasia
ZHAN Jindian
WU Yunlong
FAN Yinuo
CHEN Zhiwen
GAO Zhang
CHEN Benlu
LU Hongduo
HU Yunhao
CHENG Changbo
FANG Hanjun
HUANG Zeqing
ZHOU Chi
CHEN Zhenqiu
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.
Keywords：developmental dysplasia of the hipacetabular center-margin anglesharp angle
Publication Date：2026-03-10
Online Publishing Date：2026-03-20(First online date of this platform, not the publication date of the document)
Pages：8( 777-784 )