S43.15 Posterior dislocation of acromioclavicular joint

Name of the Condition

• Posterior Dislocation of Acromioclavicular Joint

Summary

This condition involves the displacement of the acromioclavicular (AC) joint, where the clavicle moves backward relative to the acromion of the scapula. It is a type of shoulder injury that typically results from trauma and may cause pain, instability, or restricted movement.

Causes

Traumatic events such as falls, direct blows to the shoulder, or forceful movements can lead to posterior 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.

Prognosis and Follow-Up

Recovery depends on the severity of the injury and treatment approach. Most patients improve with appropriate care, but follow-up may be needed to monitor for complications or recurrence.

Complications

• Chronic shoulder instability.
• Nerve or vascular damage.
• Persistent pain or limited mobility.

Lifestyle & Prevention

• Avoid high-risk activities or use protective gear during sports.
• Strengthen shoulder muscles through exercise.
• Maintain proper posture and body mechanics.

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 direction of dislocation (posterior) and any associated injuries. Ensure clinical details support the specificity of this code.