Radiographic evaluation of the hip rotation centre after total joint replacement in hip dysplasia

A retrospective study was conducted to correlate the clinical result of joint replacement in dysplastic hips with the obtained modifications of the rotation centre. Sixty primary total hip arthroplasties were performed on 46 patients suffering from hip dysplasia at our institution. The radiographic evaluation of the hip rotation centre was performed using the method proposed by Pierchon. The clinical assessment was by Harris Hip Score. Our results revealed that it was possible to modify the position of the pathological rotational centre with a statistically significant difference (p<0.05) for both coordinates. The general clinical evaluation relates well to the radiological evaluation as the average HHS increased to 92.683 (p<0.05). The data from our study are in accordance with the most recent literature and confirm the importance of a suitable biomechanical position of the hip rotation centre in a distal and medial sense. (Hip International 2005; 15: 92-7).