Osteochondritis Dissecans Lesion of the Radial Head.

This case shows an atypical presentation of an osteochondritis dissecans (OCD) lesion of the radial head with detachment diagnosed on plain radiographs and magnetic resonance imaging (MRI). OCD lesions are rather uncommon in the elbow joint; however, when present, these lesions are typically seen in throwing athletes or gymnasts who engage in activities involving repetitive trauma to the elbow. Involvement of the radial head is extremely rare, accounting for <5% of all elbow OCD lesions. Conventional radiographs have low sensitivity for detecting OCD lesions and may frequently miss these lesions in the early stages. MRI, the imaging modality of choice, can detect these lesions at the earliest stage and provide a clear picture of the involved articular cartilage and underlying bone. Treatment options can vary between nonoperative and operative management depending on several factors, including age and activity level of the patient, size and type of lesion, and clinical presentation. This case represents a radial head OCD lesion managed by arthroscopic débridement alone, resulting in a positive outcome.