Osteochondritis Dissecans

Osteochondritis dissecans occurs when a small area of bone beneath the cartilage at a joint loses part of its blood supply. The bone and the overlying cartilage can then weaken, crack, or separate from the joint surface. It most often affects the knee, but it can also involve the elbow or ankle. This osteochondritis condition is seen especially often in active children and adolescents, although adults can also develop it.

The exact cause of osteochondritis dissecans is often uncertain. Repeated stress on a growing joint and reduced blood flow to a small area of the underlying bone may both contribute. It is not the same as a single traumatic fracture, although an injury may draw attention to a lesion that was already present.

The knee is affected most often because it absorbs repeated forces during walking, running, jumping, and sports. Lesions can also occur in the elbow, particularly with repeated throwing or weight-bearing, and in the ankle, including the talus bone. These location differences can affect symptoms and treatment decisions.

Age and skeletal maturity are non-modifiable factors, while the amount and type of joint stress may sometimes be adjusted. However, activity is not proof that someone caused the condition, and many active children and teens with osteochondritis dissecans have no single identifiable trigger. A clinician or physical therapist can help individualize changes to training, rest, and rehabilitation.

Complications are more concerning when the lesion is unstable or a bone-and-cartilage fragment has separated from the joint surface. Timely assessment can help determine whether the lesion may heal and guide osteochondritis dissecans treatment before progressive cartilage damage affects joint function.

A clinician will ask about pain, activity, previous injuries, and mechanical symptoms such as clicking, catching, or locking. The examination may include checking for tenderness, swelling, alignment, range of motion, and joint stability. The affected joint and the person’s age help guide the choice of imaging.

Osteochondritis dissecans treatment aims to reduce stress on the joint, support healing when possible, preserve the cartilage surface, and restore function. Age, lesion stability, symptoms, location, and previous treatment all influence whether nonsurgical care or surgery is recommended.

Nonsurgical Care

Stable lesions, particularly in children and adolescents who are still growing, may be treated by temporarily stopping impact or repetitive activities. A clinician may recommend pain relief, physical therapy, crutches, immobilization, or a brace such as a knee brace for osteochondritis dissecans. Follow-up examinations and imaging help track healing, and activity is resumed gradually when symptoms, strength, motion, and clinical findings improve.

Surgical Treatment

Surgery may be considered for an unstable lesion, a loose fragment, persistent symptoms, or a lesion that does not heal with nonsurgical care. Arthroscopy can be used to assess the joint and may allow a surgeon to secure a loose fragment, remove a fragment that cannot be preserved, stimulate bone healing, or restore the joint surface with a repair or grafting procedure. Recovery depends on the specific procedure and whether the knee, elbow, or ankle is involved.

Many stable lesions in children and adolescents can heal with appropriate activity restriction and monitoring, especially while the growth plates remain open. Unstable lesions, separated fragments, or lesions in adults may be less likely to heal without intervention.

Recovery is individualized and depends on the joint involved, lesion size and stability, treatment, and rehabilitation. Return to sports should occur only when symptoms have improved and strength and motion have returned, with imaging or clinician assessment supporting a safe progression when appropriate. Osteochondritis dissecans of the talus and other ankle lesions may have recovery needs that differ from knee lesions.