[Osteochondritis dissecans of the acetabulum]

A case of osteochondritis dissecans (OD) of the acetabulum in a 14-year-old girl is presented. The initial clinical manifestation was hip pain and restricted movements of the joint. Magnetic Resonance Imaging confirmed the diagnosis. The patient was treated conservatively, using crutches. One year after the first examination, no clinical improvements were found. X-rays of the hip showed increased sclerosis around the osteochondritis-segment, indicating incipient healing. The patient is still conservatively treated, with regular clinical examinations. The diagnosis should be remembered in the case of patients with unexplained hip-pain, and may require magnetic resonance imaging for confirmation.