S49.142 Salter-Harris Type IV physeal fracture of lower end of humerus, left arm

Name of the Condition

• Salter-Harris Type IV physeal fracture of lower end of humerus, left arm (ICD-10 Code: S49.142)

Summary

This code describes a Salter-Harris Type IV fracture involving the growth plate (physeal) at the lower end of the left humerus. This type of fracture extends through the metaphysis, physis, and epiphysis, potentially disrupting both bone growth and joint stability. It is most common in children and adolescents due to the relative weakness of the growth plate during development.

Causes

Trauma is the primary cause, typically resulting from a fall onto an outstretched hand or a direct blow to the elbow. Sports-related injuries, such as those from contact sports or activities involving forceful arm movement, are frequent mechanisms. The force applied to the elbow can cause a complex fracture involving multiple bone structures.

Risk Factors

• Age (most common in children and adolescents with open growth plates)
• Participation in high-impact or contact sports
• Prior growth plate injuries or developmental abnormalities
• Activities involving repetitive stress on the elbow

Symptoms

• Pain and swelling localized to the elbow or lower arm
• Tenderness over the distal humeral growth plate
• Limited range of motion in the affected arm
• Possible visible deformity in severe cases
• Difficulty moving or bearing weight on the arm

Diagnosis

Diagnosis relies on a physical examination and imaging studies, typically X-rays, to visualize the fracture pattern. The vertical fracture line extending through the metaphysis, physis, and epiphysis is characteristic of a Type IV injury. Additional imaging, such as CT or MRI, may be used to assess joint involvement or displacement.

Treatment Options

Treatment depends on the severity of the fracture and displacement. Nondisplaced fractures may be managed with immobilization in a cast or splint. Displaced fractures often require surgical intervention to realign the bone and stabilize the growth plate, using pins or screws. Post-treatment, physical therapy may be necessary to restore range of motion and strength.

Prognosis and Follow-Up

Prognosis varies based on the accuracy of reduction and the extent of growth plate damage. Close follow-up with imaging is essential to monitor for growth disturbances or joint issues. Long-term outcomes depend on proper alignment and adherence to rehabilitation protocols.

Complications

Potential complications include growth plate arrest, leading to limb length discrepancy or angular deformity, joint stiffness, and post-traumatic arthritis. Infection or hardware-related issues may occur with surgical intervention.

Lifestyle & Prevention

Preventive measures include using protective gear during sports, avoiding high-risk activities, and ensuring proper technique in physical activities. Strengthening exercises for the arm and elbow may help reduce injury risk.

When to Seek Professional Help

Seek immediate medical attention for severe pain, visible deformity, inability to move the arm, or after a significant injury to the elbow. Persistent swelling, pain, or limited motion after initial treatment also warrants evaluation.

Tips for Medical Coders

Use this code for a Salter-Harris Type IV physeal fracture of the lower humerus, left arm. Ensure documentation specifies the fracture type, location, and laterality. Differentiate from other Salter-Harris types and confirm the left arm involvement to assign the correct code.