title: 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.
authors.affiliation: 1 Department of Orthopaedic Surgery, Faculty of Medicine, Fukuoka University, Fukuoka - Japan.
authors.forename: Yoshitsugu
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Shigeaki
authors.initials: S
authors.lastname: Moriyama
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Naito