Osteochondritis Dissecans of the Elbow

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Clinically Relevant Anatomy

Involved anatomy of this disorder includes the radial head or the central and/or lateral aspect of the capitellum.

Mechanism of Injury / Pathological Process

Ostechondrosis of the humeral capitellum is secondary to repetitive compressive forces between radial head and capitellum. This injury results in a loose body containing an osteochondral bone fragment that is detached from the articular surface. Causes of this pathology include injury or stress on the joint, lack of blood supply, and/or genetic makeup.
Repetitive high stress forces on the joint can result in a series of minor injuries on the elbow that can eventually lead to a fracture and ultimately detachment of the bony fragment from the bone.
Blockage of a small artery can also be a factor in this pathology. Lack of blood supply contributes to break down or death of bone tissue. Osteochondritis dissecans also has a genetic component allowing a predisposition to the pathology.

Staging of osteochondritis dissecans is depicted below:

Staging of Osteochondritis Dissecans ²

Stage Appearance on MRI Stability of Lesion

I Thickening of cartilage and Stable
low signal changes

II Articular cartilage interrupted, Stable
low signal rim behind fragment
showing that there is fibrous
attachment

III Articular cartilage interuppted, Unstable
high signal changes behind
fragment and underlying
subchondral bone

IV Loose body Unstable

Clinical Presentation

Presentation includes pain over the joint, stiffness, feeling of instability, and stiffness after resting.

Diagnostic Procedures

Radiographs can detect any abnormalities on the surface of the joint.

Magnetic Resonance Imaging (MRI) will show any accumulation of fluid in the area and can detect any loose fragments.

Computerized Tomography (CT) can detect any bony fragments, pinpoint their location and determine whether they have settled in the joint space.

Outcome Measures

An outcome measure appropriate for this injury is the DASH questionnaire which measures disabilities of the arm, shoulder and hand as they relate to everyday function. A modified Andrews elbow scoring system (MAESS) is used to determine specific function of the elbow.

Management / Intervention

Conservative care for this condition include physical therapy, use of non-steroidal anti-inflammatory drugs (NSAIDs), rest from sport from 6-8 weeks, and bracing.
Surgical management may be an option if conservative care fails or if the lesion is Grade III or higher.
Surgical interventions are aimed at:
Promoting re-vascularization to the area
Debriding the area
Fragment stabilization
Bone grafting if needed
Most of these procedures are done arthroscopically (minimally invasive via portal sites); although depending on the size of the loose fragments an open procedure may be required.

Differential Diagnosis

If there is no radiologic confirmation of osteochondritis dissecans, other diagnoses may include inflammatory arthritides, osteoarthritis, bone cysts, and septic arthritis.

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