Bilateral core decompression for osteonecrosis of the femoral head.

UNLABELLED: Early treatment of osteonecrosis of the femoral head yields better results than late treatment. Because osteonecrosis frequently is bilateral, it often is advisable to treat both hips simultaneously. Core decompression is one of the more common methods of treatment; however the safety of doing simultaneous bilateral core decompression has been questioned. We sought to evaluate the safety and effectiveness of simultaneous bilateral core decompression compared with unilateral core decompression. One hundred ninety-three patients (276 hips) who had core decompression with bone grafting were followed up for 24 to 145 months. One hundred twenty-four procedures were unilateral and 152 were bilateral. Patients were evaluated by change in Harris hip score, radiographic progression, postoperative complications, and conversion to total hip arthroplasty. Total hip arthroplasty was required in 56 of 124 (45%) of hips in the unilateral, and 48 of 152 (32%) of hips in the bilateral group. Postoperative complications were similar. In the unilateral group there were two major and nine minor complications; in the bilateral group there were three major and 10 minor complications. When bilateral core decompression is indicated, it can be done simultaneously on both hips, allowing earlier treatment of the contralateral hip without risk of increased complications and possibly with a better outcome. It requires only one hospitalization and decreases recovery time compared with two separate procedures. Therefore, it provides advantages over procedures that cannot be done simultaneously on both hips. LEVEL OF EVIDENCE: Therapeutic study, Level IV (case series-no common or historical control group). See the Guidelines for Authors for a complete description of levels of evidence.