Cemented Hemiarthroplasty in Femoral Neck Fractures over 70 Years : A Matched-Pair Analysis of unipolar and Bipolar Hemiarthroplasty

Yoon, Kang Sup; Kang, Seung Baik; Lee, Ji Ho; Tark, Jin Soo; Rhyou, Hyeok

Abstract

PURPOSE : The goal of treatment in elderly patients with hip fractures is restoration of function We analysed the clinical efficacy of the cemented unipolar hemiarthroplasty and bipolar hemiarthroplalty for the treatment of femoral neck fractures in elderly patients over 70 years. Twenty-four pairs of patients who had a cemented hemiarthroplasty were studied with a retrospective and matched-pair analysis. Half of the patients had received a cemented bipolar hemiarthroplasty and the other half, a cemented unipolar hemiarthroplasty The patients were matched for age, sex, femoral head size, physical status and the ability to walk. At one year follow-up, the frequency of the pain and the limp were 41.7% and 54.2%, respectively, in the unipolar group and 45.8% and 45.8%, respertively, in the bipolar group. The ability to live independently was 66.7% in the unipolar group and 79.2% in the bipolar group. None of these differences were statistically significant. The frequency of the return to the level of function before injury was 37.5% in unipolar group and 45.8% in the bipolar group, which was also not significantly different. Flexion of the hip joint was 96.7+/-6.9 in unipolar group and 101.5+/-7.3 in the bipolar group(p=0.02). Abduction and rotational motion was not significantly different in two groups. There were no revisions in either group. Cemented bipolar hemiarthroplasty did not show better clinical results than cemented unipolar group.