Skip to content
Foot & Ankle

Osteochondritis Dissecans: a cartilage-and-bone lesion in the joint.

Osteochondritis dissecans is a lesion of the cartilage and the bone beneath it, often in the ankle or knee. Stable lesions can heal without surgery; unstable or loose ones are treated arthroscopically.

Written bySteven J. Lee, MD · Double Fellowship-Trained · Hand & Sports Medicine
Last reviewed · May 2026

Osteochondritis dissecans (OCD) is a problem of the cartilage and the layer of bone just beneath it, where a segment loses its blood supply or is injured and can begin to separate. In the ankle it usually affects the talus, the bone of the lower ankle joint, and it also occurs in the knee.

OCD can follow an injury, such as an ankle sprain, or develop from repetitive stress. Whether it is treated without surgery depends largely on whether the lesion is stable and still attached, or unstable and at risk of becoming a loose fragment in the joint.

Symptoms

Common findings include:

  • Deep, aching joint pain, often after an ankle injury that did not fully settle
  • Swelling with activity
  • Catching, locking, or a sense of something loose in the joint
  • Pain that lingers well beyond a typical sprain

How it is diagnosed

X-rays may show the lesion, but MRI is the key test, it shows the cartilage, the bone beneath, and whether the fragment is stable or separating. That stability assessment is what guides whether surgery is needed.

Dr. Lee's approach

The central question is stability. A stable OCD lesion, especially in a younger patient with open growth plates, can often heal without surgery, with a period of protected weight-bearing and activity modification.

An unstable lesion, a loose fragment, or a lesion that has not healed with non-surgical care is treated arthroscopically, by stabilizing the fragment, stimulating new cartilage, or addressing the underlying bone, depending on the size and condition of the lesion. Identifying instability early is what protects the joint surface.

Non-surgical treatment

Stable lesions are treated with protected weight-bearing and activity modification, giving the cartilage and bone a chance to heal. This is more often successful in younger patients with growth remaining.

Surgical treatment

Unstable lesions, loose fragments, and lesions that fail non-surgical care are treated arthroscopically. Depending on the lesion, the surgery stabilizes the fragment, stimulates new cartilage, or addresses the bone beneath. The goal is a stable, smooth joint surface.

Recovery timeline

Recovery depends on stability and treatment:

  1. Non-surgical
    A period of protected weight-bearing and activity modification, monitored with imaging.
  2. After surgery, weeks 0 to 6
    Protected weight-bearing with early motion, depending on the procedure.
  3. Months 3 to 6
    Progressive return to loading and sport as the cartilage and bone heal.

What patients commonly misunderstand

Two things to keep in view:

  • It can hide behind a 'sprain.' An OCD lesion in the ankle often follows a sprain and explains pain that lingers well beyond it. Persistent post-sprain pain is a reason to look at the cartilage with an MRI.
  • Stability drives the plan. Whether an OCD lesion needs surgery depends mostly on whether it is stable and attached, or unstable and separating. The MRI assessment of stability is the key piece.

This page is general educational content authored by Dr. Lee. It is not a substitute for individual medical advice. Every patient's case is different, book a consultation to discuss yours.

Book an appointmentRequest a second opinion
Patient questions

Osteochondritis dissecans, answered.

  • What is osteochondritis dissecans?

    It is a lesion of the cartilage and the bone just beneath it, where a segment is injured or loses its blood supply and can begin to separate. In the ankle it usually affects the talus, and it also occurs in the knee. It can follow an injury like an ankle sprain or develop from repetitive stress.

  • Do I need surgery?

    It depends on whether the lesion is stable. A stable, attached lesion, especially in a younger patient, can often heal with protected weight-bearing and activity modification. An unstable lesion, a loose fragment, or one that fails non-surgical care is treated arthroscopically. An MRI assessment of stability guides the decision.

  • Could this be why my ankle still hurts after a sprain?

    Possibly. An OCD lesion of the ankle often follows a sprain and explains deep pain, swelling, or catching that lingers well beyond a typical sprain. Persistent post-sprain pain is a reason to look at the cartilage with an MRI.

Next step

Deep joint pain that lingers after an injury? The cartilage is worth a look.

Osteochondritis dissecans is a cartilage-and-bone lesion that often hides behind a stubborn ankle sprain. Stable lesions can heal without surgery, while unstable ones are treated arthroscopically. An MRI assessment of stability directs the plan.

Book via ZocDocView other conditions