It is not entirely known why children develop Osteochondritis dissecans (OCD), but could be loss of blood supply to a piece of bone or overuse of a joint. There are three different types of OCD:

• Mild OCD: A piece of bone has begun to separate from the joint, but this piece is still firmly held in place by a covering of cartilage.
• Moderate OCD: The piece of bone separates more. The covering of cartilage may tear.
• Severe OCD: The piece of bone and covering of cartilage become loose and "float around" in the joint.

Signs and symptoms of Osteochondritis Dissecans (OCD)

• Soreness
• Swelling
• Stiffness
• Feeling that the joint is “locking up”
• Limping

The goal of treatment for Osteochondritis dissecans (OCD) is to heal the separate piece of bone and cartilage back onto the joint. This healing takes time, often up to six months. Treatment can include:

• Rest and stop activity that causes pain. Avoid running and jumping.
• Ice the joint
• Take over-the-counter anti-inflammatory medication including ibuprofen and naproxen.
• Use crutches to lessen stress on the knee or ankle joint, or wear a brace or cast
• The doctor may recommend surgery in moderate to severe cases