Osteochondritis dissecans (OD) is a joint disorder that mostly affects children and adolescents. Cracks occur in the articular cartilage, causing pain and swelling. Symptoms can be visible right after an injury to the joint, or it may take a few months of mobility and activity to feel the impact. Though OD can affect any joint, it most often occurs in the knee. Nobody knows the exact cause of the disorder, but doctors believe it results from repetitive trauma. Rest and physical therapy can help treat OD.

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