S43.142A Inferior dislocation of left acromioclavicular joint, initial encounter

Name of the Condition

• Inferior Dislocation of Left Acromioclavicular Joint, Initial Encounter

Summary

This condition involves the downward displacement of the left acromioclavicular (AC) joint, where the clavicle meets the acromion of the scapula. It is a specific type of shoulder injury resulting from trauma and is classified as an initial encounter, indicating recent onset. The injury may cause pain, instability, or restricted movement in the affected shoulder.

Causes

Traumatic events such as falls, direct blows to the shoulder, or forceful movements can cause inferior dislocation of the AC joint. Sports injuries, motor vehicle accidents, or falls onto an outstretched hand are common triggers. The mechanism typically involves significant force applied to the shoulder, leading to the clavicle displacing downward relative to the acromion.

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 left 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. The initial encounter classification indicates the injury is being evaluated for the first time.

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, involving ligament repair or stabilization.

Prognosis and Follow-Up

Most patients recover with appropriate treatment, though recovery time varies. Follow-up care may include physical therapy to regain strength and mobility. Long-term outcomes depend on the severity of the injury and adherence to rehabilitation.

Complications

• Chronic shoulder instability or recurrent dislocation.
• Nerve or vascular damage in severe cases.
• Persistent pain or reduced range of motion if untreated.

Lifestyle & Prevention

• Use protective gear during contact sports.
• Avoid high-risk activities without proper conditioning.
• Strengthen shoulder muscles through regular exercise to improve stability.

When to Seek Professional Help

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

Tips for Medical Coders

Document the laterality (left) and encounter type (initial) clearly in the medical record. Ensure the diagnosis aligns with clinical findings and imaging results to support accurate coding.