S43.022 Posterior subluxation of left humerus

Name of the Condition

• Posterior Subluxation of Left Humerus

Summary

This condition involves the partial displacement of the left humerus from the glenoid fossa of the scapula, with the humeral head moving backward (posteriorly). It typically results from trauma or injury and may cause pain, instability, or restricted movement in the shoulder joint.

Causes

The primary cause is trauma, such as a fall, direct blow to the shoulder, or forceful movement that exceeds the joint's normal range of motion. Sports injuries, motor vehicle accidents, or falls are common triggers. Repetitive overhead activities or underlying joint instability may also contribute.

Risk Factors

• Participation in contact sports or activities with high shoulder strain.
• Previous shoulder dislocations or subluxations.
• Age-related joint laxity or connective tissue disorders.
• Occupations requiring repetitive overhead movements.

Symptoms

• Intense shoulder pain, especially with movement.
• Visible deformity or abnormal shoulder contour.
• Swelling, bruising, or tenderness around the joint.
• Limited range of motion or inability to move the arm.
• Sensation of the shoulder "popping out" or feeling unstable.

Diagnosis

Diagnosis begins with a clinical examination to assess pain, deformity, and range of motion. Imaging studies like X-rays or CT scans may be used to confirm the partial displacement and rule out other injuries.

Treatment Options

Treatment may include closed reduction to realign the joint, followed by immobilization with a sling or brace. Physical therapy is often recommended to restore strength and mobility. Pain management with medications or modalities may also be used.

Prognosis and Follow-Up

Prognosis is generally good with proper treatment, though some individuals may experience residual instability. Follow-up care typically involves monitoring for recurrence and gradual return to activity, guided by clinical progress.

Complications

Potential complications include chronic shoulder instability, recurrent subluxation, or progression to complete dislocation. Nerve or vascular injury is rare but possible with severe trauma.

Lifestyle & Prevention

Avoid activities that strain the shoulder, especially after injury. Strengthening exercises and proper technique in sports or work can reduce risk. Use protective gear during high-impact activities.

When to Seek Professional Help

Seek immediate care if there is severe pain, visible deformity, inability to move the arm, or signs of nerve/vascular compromise (e.g., numbness, discoloration).

Tips for Medical Coders

Document the laterality (left) and the nature of the injury (posterior subluxation) clearly. Ensure clinical notes support the diagnosis and any associated treatments or encounters.