An osteochondral defect (OCD) of the elbow is an injury to the articular cartilage and the underlying bone, most commonly affecting the capitellum — the rounded portion of the lateral humerus that articulates with the radial head. It is most frequently seen in young overhead and throwing athletes.
OCD lesions of the elbow are closely associated with repetitive lateral compression forces and are often found alongside other lateral elbow pathology. In some cases, a loose body — a fragment of cartilage or bone — can break free into the joint, causing locking or catching symptoms similar to those seen with UCL instability on the medial side.
Causes
Sports-related and repetitive stress causes
Repetitive compressive loading across the lateral elbow — as occurs with throwing, gymnastics, and racquet sports — is the primary driver of capitellar OCD. Young athletes with open growth plates are particularly vulnerable, as the blood supply to the capitellum is tenuous during adolescence, making it susceptible to avascular necrosis (Panner's disease) in younger children and OCD in older adolescents.
Other contributing factors
- Acute trauma: A direct impact or fall on an outstretched hand can cause an immediate osteochondral injury, though this is less common than the repetitive stress mechanism.
- Joint instability: Ligament injuries or generalized joint laxity can create abnormal force distribution within the elbow, increasing cartilage stress and predisposing the joint to OCD lesions.
- Vascular insufficiency: Poor blood supply to the subchondral bone — from vascular injury or anatomical variation — can compromise bone health and accelerate cartilage breakdown.
- Genetic factors: Some individuals have cartilage that is constitutionally more susceptible to damage or less capable of effective self-repair.
- Underlying joint disorders: Conditions such as osteoarthritis or inflammatory arthritis can weaken cartilage and increase the risk of osteochondral injury even with normal levels of activity.
- Congenital abnormalities: Rarely, developmental irregularities in joint morphology may predispose to osteochondral defects from an early age.
Symptoms
Lateral elbow pain that worsens with activity is the most common complaint. Patients may notice stiffness and a loss of full elbow extension. Swelling around the lateral elbow may develop after activity. If a loose body is present, mechanical symptoms such as locking, catching, or a grinding sensation (crepitus) within the joint may occur — and range of motion may become restricted. Some patients describe a feeling of joint instability, particularly with activities that load the lateral elbow.
Diagnosis
X-rays may show irregularity of the capitellum or a visible loose body but are often normal in early disease. MRI is the definitive imaging tool for assessing the size, stability, and depth of the lesion, the integrity of the overlying cartilage, and the presence of any loose bodies within the joint.
A dedicated elbow MRI allows the radiologist to stage the lesion accurately and determine whether it is stable (intact cartilage surface) or unstable (cartilage fissured or fragment detached) — the key distinction driving treatment decisions. CT may occasionally be added to assess bony detail when surgical planning requires it.
Classification
OCD lesions of the elbow are commonly staged by MRI appearance:
- Stage I: Thickening or signal change in the subchondral bone; cartilage surface intact and stable.
- Stage II: Fissuring or partial detachment of the cartilage; fragment still in place but at risk of displacement.
- Stage III: Complete detachment — loose body free within the joint.
Treatments
Treatment is guided by lesion stage, patient age, skeletal maturity, and activity level.
Stable lesions (Stage I–II) in skeletally immature patients: Activity restriction and rest from overhead sport for 3–6 months, with physical therapy to maintain motion and strength. NSAIDs may be used to manage pain and inflammation. Many stable lesions in young patients will heal with conservative management, and serial MRI is used to monitor progress.
Unstable or Stage III lesions in active patients
Surgical intervention is recommended for unstable lesions, free loose bodies, or cases that have failed conservative management. Options include:
- Arthroscopic debridement: Removal of loose fragments and smoothing of damaged surfaces to reduce mechanical symptoms.
- Microfracture: Tiny perforations in the subchondral bone to stimulate fibrocartilage repair tissue formation.
- Osteochondral autograft transfer (OATS): Healthy cartilage and bone plugs are harvested from a low-load area of the patient's own joint and transferred to the defect.
- Autologous chondrocyte implantation (ACI): The patient's own cartilage cells are harvested, cultured, and reimplanted to regenerate cartilage at the defect site.
- Osteochondral allograft transplantation: For large or complex defects, donor cartilage and bone tissue replace the damaged area when autograft is insufficient.
Return to sport after surgery typically takes 6–12 months depending on the procedure.
Older or lower-demand patients
In skeletally mature patients who are not pursuing overhead sport, conservative management with activity modification, hyaluronic acid injections for joint lubrication, and symptom control may be appropriate — even for more advanced lesions — provided mechanical symptoms are not significantly limiting function.
Get an MRI to Confirm Your Diagnosis
Before surgical planning or starting treatment, a clear MRI diagnosis ensures the right path forward. First Look MRI offers self-pay Elbow MRI scans — no doctor's order or insurance required — at our locations in Georgia, Texas, and Colorado.