Multivariate Analysis of Femoral Adductor Muscle Contracture after Total Hip Arthroplasty in Patients with Avascular Necrosis of Femoral Head

Abstract

Objective: This study is to investigate the risk factors of femoral head contracture after total hip arthroplasty (THA) in patients with avascular necrosis of femoral head. Methods: Retrospective analysis was performed in 361 cases of femoral head necrosis patients taking THA from September 2016 to December 2017. A total of 179 patients with no significant preoperative adductor muscle contraction were finally enrolled in this study. These 179 patients were further divided into two groups: contracture group (64 cases) and noncompaction group (115 cases). The chi-square test was used to compare the differences between the two groups. Risk factors were identified by logistic regression analysis. Results: Of the patients included, 64 patients (35.75%) developed into end adductor muscle contracture. There were significant differences in limb shortening, surgical history, whether traction, surgical approach, surgical methods, and functional training between the two groups (P<0.05). Logistic regression analysis showed that shortness of extremity, surgical approach, effective traction, surgical history, and etiology were the factors affecting femoral head contracture after THA in patients with avascular necrosis of femoral head. Conclusions: Preoperative traction therapy, surgical methods, and postoperative functional training are the factors that affect the adductor muscle contraction after THA.