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Updated: Jan 19, 2026
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Plain radiography findings to predict dislocation after total hip arthroplasty
Qing Liu1, Xiaoguang Cheng2, Dong Yan2
1Department of Orthopaedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, China.
New radiography findings can predict dislocation after total hip arthroplasty (THA). Preoperative hip adduction deformity, limb lengthening, knee valgus, pelvic obliquity, and bilateral hip issues are key risk factors for THA dislocation.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomedical Engineering
Background:
- Causes of dislocation after total hip arthroplasty (THA) are evolving with surgical advancements.
- Plain radiography is crucial for identifying new risk factors for THA dislocation.
Purpose of the Study:
- To identify novel plain radiography findings predictive of dislocation after THA.
- To analyze factors influencing prosthetic stability in THA patients.
Main Methods:
- Retrospective analysis of 5,513 primary THAs (2000-2014).
- Nested case-control study comparing 39 dislocations with 78 controls.
- Univariate and multivariate logistic regression analyses were performed.
Main Results:
- Cup position was not a significant factor in dislocation.
- Identified risk factors: preoperative hip adduction deformity with postoperative limb lengthening, knee valgus with pelvic obliquity, and bilateral pathological hips.
Conclusions:
- Soft tissue imbalance, across-joint deformity, and bilateral hip pathology increase THA dislocation risk.
- Tailored surgical strategies and meticulous postoperative management are vital for preventing THA dislocation.
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