S43.149 Inferior dislocation of unspecified acromioclavicular joint

Name of the Condition

• Inferior Dislocation of Unspecified Acromioclavicular Joint

Summary

This condition involves the downward displacement of the acromioclavicular (AC) joint, where the clavicle moves below 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 inferior 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 intervention may be considered for severe cases or persistent instability.

Prognosis and Follow-Up

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

Complications

• Chronic shoulder instability or pain.
• Nerve or vascular damage in severe cases.
• Arthritis or degenerative changes in the joint over time.

Lifestyle & Prevention

• Use protective gear during contact sports.
• Avoid high-risk activities if previous shoulder injuries exist.
• Strengthen shoulder muscles through regular exercise.

When to Seek Professional Help

Seek medical attention if shoulder pain is severe, deformity is visible, or movement is significantly restricted after an injury.

Tips for Medical Coders

Document the side (right/left/unspecified) and type of dislocation (inferior) clearly. Ensure clinical notes support the diagnosis and specify any associated injuries or treatments for accurate coding.