[Cephalic prosthesis for fractures of the femoral neck (702 cases). Comparative results of simple and intermediate cephalic prostheses].

The authors are presenting a retrospective study of the long time results of 702 femoral cephalic endoprostheses, 451 unipolar and 251 bipolar. The mean age of the patients at the moment of intervention was 80 years, the operation was done in the majority of the cases for a fracture of the femoral neck. The average follow-up was 33 months for the unipolar, and 24 months for the bipolar prostheses. The rate of reoperations was similar in both series, but the rate of luxations was slightly lower for the unipolar prostheses. 82 patients (out of 120 surviving) have been controlled with an average follow-up of 6.5 and 4.5 years. The unipolar prostheses had a lower average New Mayo Hip Score (58.5 vs. 68.2). Radiologically, there were 7 acetabular protrusions in the group of unipolar prostheses and none in the other group. If both types of prostheses have their place in surgery of the hip, the authors recommend to implant bipolar prostheses in younger and more active patients, where a survival of many years is expected.