Is Stage 2 idiopathic osteonecrosis of the hip jointassociated with version angles on imaging methods?

Abstract

Objectives: In this study, we aimed to investigate whetheranatomical variations of acetabulum were associated to idiopathicosteonecrosis (ON) of the femoral head. Patients and methods: Between January 2014 and March 2020,a total of 46 patients (32 males, 14 females; mean age: 43 years;range, 18 to 66 years) who were diagnosed with unilateral orbilateral ON of the hip joint and 44 healthy age- and sex-matchedcontrols (30 males, 14 females; mean age: 46 years; range, 18 to79 years) with no signs of ON of the hip joint were retrospectivelyanalyzed. For both groups, measurements were taken of theanatomic parameters, including the acetabular version angle(VA), the sharp angle (SA), and the center-edge angle (CEA)on anteroposterior pelvic radiographs and magnetic resonanceimaging (MRI) scans. Results: The mean VA of both hips was found to be significantlysmaller in Group 1 than in Group 2 on both MRI and X-ray(14.9±4.1 and 14.4±3.1 vs. 17.3±3.9 and 18.0±3.7, respectively;p=0.004, p