Imaging of Osteochondritis Dissecans of the Knee

The imaging goals in patients with osteochondritis dissecans are lesion identification, characterization, staging, and follow-up. The macroscopic features visible by imaging reflect the microscopic histology of the abnormality. Osteochondritis dissecans involves subchondral bone with possible resultant effect on the overlying articular cartilage. Unresolved, degenerative arthritis, effusion, and loose bodies may occur. In this article, features of the disorder as they appear on plain film, bone scintigraphy, and magnetic resonance imaging are reviewed.