Abstract
Objective: Total hip arthroplasty (THA) in a completely dislocated hip can still be combined with a proximal femoral osteotomy for positioning the acetabular component in the true acetabulum. However, the bone stock and bone quality of the true acetabulum in a completely dislocated hip is usually poor. Therefore, the acetabular component must be place low in the hip center. This study investigated the perioperative results of low hip center acetabular components.
Methods: THA combined with a subtrochanteric osteotomy was performed on 67 completely dislocated hips. These hips were divided into three groups based on the hip center. The cup size, number of screws, and complications of the acetabular component were compared.
Results: Eleven hips (16%) were assigned to the high hip center group, 50 (75%) to the middle hip center, and 6 (9%) to the low hip center. There was no significant difference in the cup size and the number of screws between the three groups. One case of cup loosening was observed in the middle hip center group.
Conclusion: The perioperative results of placement of an acetabular component in the low hip center in completely dislocated hips showed good acetabular component fixation. The low hip center seems to be a good option when patients undergo THA for a completely dislocated hip.
