Osteoid osteoma of the acetabular fossa: five cases treated with percutaneous resection.

BACKGROUND Osteoid osteoma is a painful benign osteogenic tumour for which the treatment objective is surgical resection of the nidus. The acetabular fossa is an uncommon site of involvement where surgical access can prove challenging. MATERIALS AND METHODS We report a case-series composed of five patients with osteoid osteoma of the acetabular fossa treated with percutaneous bone resection and drilling under computed tomography guidance. RESULTS All five patients had an uneventful postoperative course with immediate pain relief that was sustained over time. DISCUSSION The outcomes achieved using our percutaneous technique compare favourably with those of other percutaneous methods, most notably regarding pain relief and patient tolerance of the procedure. CONCLUSION Percutaneous bone resection and drilling under computed tomography guidance proved effective for the treatment of osteoid osteoma involving the acetabular fossa. LEVEL OF EVIDENCE Level IV.