Arthroscopic extirpation of an osteoid osteoma of the acetabulum

We present the case of a 16-year-old boy with an 18-month history of pain i n the left groin for 18 months. In addition to the simple radiographic exam ination, magnetic resonance imaging, bone scan, and computed tomography wer e necessary to finally diagnose an acetabulum osteoid osteoma (AOO). Excisi on of the lesion was performed arthroscopically and pathologic testing conf irmed the diagnosis. The patient's symptoms disappeared immediately after t he surgery, and had not reappeared as of the 6-month postoperative evaluati on. We conclude that arthroscopic excision of an AOO is possible and avoids the aggressive open approach as well as operative hip dislocation.