Intra-articular osteoid osteoma of the hip mimicking as monoarthritis-A case report

Osteoid osteoma is a common benign bone tumor affecting young adults with the typical clinical and radiological presentation when arising from common locations. However, when they arise from unusual locations like intra-articular regions the diagnosis may be confusing thereby leading to delay in diagnosis and appropriate management. Here we present a case with an intra-articular osteoid osteoma of the hip involving the anterolateral quadrant of the femoral head.

An active 24-year-old man, with no relevant or significant medical history presented with progressive left hip pain radiating to the thigh for the past 1 year. There was no significant history of trauma. His initial symptoms were dull aching groin pain which worsened over weeks, associated with night cries, and loss of weight and appetite.

The unusual site of presentation led to a diagnostic challenge and caused a delay in diagnosis. Computed tomography scan is the gold standard to detect osteoid osteoma and radiofrequency ablation can be used as a reliable and safe modality of the treatment for intra-articular lesions.