Analysis of Medialisation of the Femoral Head in Periacetabular Osteotomy Using Three-Dimensional Computed Tomography

Abstract

Background

Periacetabular osteotomy has been established as an effective treatment for osteoarthritis caused by developmental dysplasia of the hip. Medialisation of the femoral head during periacetabular osteotomy is crucial for providing significant reduction in joint contact stress. The purpose of this study was to evaluate effective procedures for medialisation of the femoral head during periacetabular osteotomy using three-dimensional computed tomography (3DCT).

Methods

Thirty hips in 30 patients with hip dysplasia underwent both radiographic and 3DCT scans before and after surgery. The direction of the rotation of the acetabular fragment and movement of the femoral head were evaluated to analyse which parameters contributed to medialisation of the femoral head.

Results

Anterior coverage of the acetabular fragment and internal rotation in the axial plane contributed to both medialisation of the femoral head and anteversion of the retroverted acetabulum.

Conclusions

This study demonstrated that re-orientation of the acetabulum was spatially confirmed by the method using 3DCT images.