S43.5 Sprain of acromioclavicular joint

Name of the Condition

• Sprain of Acromioclavicular Joint

Summary

A sprain of the acromioclavicular (AC) joint occurs when the ligaments connecting the acromion (part of the scapula) and clavicle (collarbone) are stretched or torn. This injury is common in athletes and can result from a direct blow to the shoulder or a fall.

Causes

The primary cause is trauma to the shoulder area, such as a fall or a direct impact during sports or physical activities.

Risk Factors

• Participation in contact sports like football or rugby.
• Activities involving the risk of falls, such as cycling or skiing.
• Previous shoulder injuries.

Symptoms

• Pain at the top of the shoulder.
• Swelling and tenderness over the joint.
• Difficulty lifting the arm or moving the shoulder.
• A visible bump or swelling over the acromioclavicular joint.

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and range of motion. Imaging studies like X-rays may be used to rule out fractures and confirm the extent of the injury. MRI is not typically necessary for initial evaluation but may be used for detailed soft tissue assessment if needed.

Treatment Options

• Rest and ice application to reduce pain and swelling.
• Use of a sling to immobilize the shoulder.
• Pain management with over-the-counter medications like ibuprofen.
• Physical therapy to restore strength and mobility once acute symptoms subside.

Prognosis and Follow-Up

Most AC joint sprains heal within 2–6 weeks with proper treatment. Severe sprains may require longer recovery. Follow-up appointments monitor healing progress and adjust treatment plans as needed.

Complications

• Chronic pain or instability if ligaments do not heal properly.
• Arthritis in the AC joint over time.
• Nerve or blood vessel damage in rare cases.

Lifestyle & Prevention

• Wear protective gear during contact sports.
• Strengthen shoulder muscles through exercise.
• Avoid falls by using proper safety equipment in high-risk activities.

When to Seek Professional Help

Seek medical attention if pain is severe, the shoulder appears deformed, or there is inability to move the arm. Immediate care is needed for signs of nerve or vascular injury.

Tips for Medical Coders

Document the mechanism of injury (e.g., fall, direct blow) and clinical findings (e.g., swelling, tenderness) to support the diagnosis. Ensure the code S43.5 is used for sprains of the acromioclavicular joint without specifying laterality or encounter type.