S43.1 Subluxation and dislocation of acromioclavicular joint

Name of the Condition

• Subluxation and Dislocation of Acromioclavicular Joint

Summary

This condition involves the partial (subluxation) or complete (dislocation) displacement of the acromioclavicular (AC) joint, where the clavicle meets the acromion of the scapula. It typically results from trauma or injury and may cause pain, instability, or restricted movement in the shoulder.

Causes

Traumatic events like falls, direct blows to the shoulder, or forceful movements can cause subluxation or dislocation. Sports injuries, motor vehicle accidents, or falls are common triggers.

Risk Factors

• Participation in contact sports or activities with high fall risk.
• Previous shoulder injuries or ligamentous instability.
• Age-related degeneration or connective tissue disorders.
• Occupations requiring repetitive arm or shoulder movements.

Symptoms

• Pain and tenderness around the top of the shoulder.
• Visible deformity or swelling over the acromioclavicular joint.
• Limited range of motion in the shoulder.
• Sensation of the joint "popping out" or feeling unstable.

Diagnosis

Diagnosis typically involves a physical examination to assess tenderness, deformity, and range of motion. Imaging tests like X-rays may be used to confirm displacement and rule out fractures.

Treatment Options

• Non-surgical treatments such as rest, ice, and physical therapy to restore movement and strength.
• Surgical options in severe cases to realign the joint and stabilize it using hardware or fixation devices.

Prognosis and Follow-Up

With appropriate treatment, many recover fully, though recovery time varies. Follow-up care may include physical therapy to restore function and prevent recurrence.

Complications

• Chronic instability or recurrent dislocation.
• Nerve or blood vessel damage in severe cases.
• Post-traumatic arthritis in the joint.

Lifestyle & Prevention

• Avoid high-risk activities or use protective gear during sports.
• Strengthen shoulder muscles through targeted exercises.
• Maintain proper posture and avoid repetitive overhead movements.

When to Seek Professional Help

Seek medical attention if you experience severe pain, visible deformity, or inability to move the shoulder after an injury.

Tips for Medical Coders

Document the type of displacement (subluxation vs. dislocation) and whether it is complete or partial. Include details on the affected side (right/left/unspecified) and encounter type (initial, subsequent, sequela) as applicable. Ensure clinical documentation supports the diagnosis to align with coding guidelines.