What is Osteochondritis Dissecans?

What Causes Osteochondritis Dissecans?

Repeated jumping, running and pivoting, stress on a growing joint, or a local blood-supply problem can weaken the bone beneath the cartilage. In the knee, the lesion commonly affects the inner part of the thighbone and a loose fragment may move within the joint.

Symptoms

• Focal knee pain that increases with running or climbing stairs
• Swelling and fullness after exercise
• Catching or locking as the knee moves
• Difficulty fully straightening or bending the knee when a fragment separates

Frequently Asked Questions

How is osteochondritis dissecans diagnosed?

The examination checks the pain location and joint motion. X-rays may show bone changes, while MRI gives more detail about early cartilage and bone involvement. In growing children with a stable lesion, reduced loading and follow-up may be enough; a loose or unstable fragment may require surgery.