Introduction: Osteoid osteoma of the acetabulum is a rare orthopedic condition. Only few cases are reported in the literature. Diagnosis of such pathology can sometimes be challenging. Arthroscopic excision of the lesion seems to be a useful minimally invasive treatment option. We report a case of osteoid osteoma of the acetabulum in an adult aged 25 years old treated arthroscopically.

Case Report: A 25-year-old male presented to us with right hip pin of insidious onset and progressive course. The patient had limited range of motion of the right hip. Initial plain radiographs were negative, and diagnosis of osteoid osteoma was highly suspected by magnetic resonance imaging and multi-slice computer tomography (CT) showing nidus close to fovea. Arthroscopic resection of the lesion was done, and the patient had dramatic pain relief during follow-up.

Conclusion: Osteoid osteoma of the acetabulum is a rare diagnosis that may be responsible for a painful hip. CT scan is the investigation of choice to confirm the diagnosis. Early diagnosis and adequate treatment by arthroscopic excision of the nidus can give good results and avoid potential complications.

Keywords: Hip arthroscopy, Excision, Osteoid osteoma, Acetabulum, Minimally invasive.

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