S49.131 Salter-Harris Type III physeal fracture of lower end of humerus, right arm

Name of the Condition

• Salter-Harris Type III physeal fracture of lower end of humerus, right arm (ICD-10 Code: S49.131)

Summary

This code describes a Salter-Harris Type III fracture involving the growth plate (physeal) at the lower end of the right humerus. This type of fracture includes a fracture through the growth plate and extends into the adjacent epiphysis (the end of the bone). It is most common in children and adolescents due to the relative weakness of the growth plate during development. The injury affects the distal humeral physis, where the upper arm bone meets the elbow joint.

Causes

Trauma is the primary cause, often resulting from a fall onto an outstretched hand or a direct blow to the elbow. Sports-related injuries, such as those from gymnastics or contact sports, are frequent mechanisms. The force applied to the elbow can disrupt the growth plate and extend into the epiphysis, causing this specific fracture pattern.

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 involves a physical examination to assess pain, swelling, and mobility. Imaging, such as X-rays, is typically used to confirm the fracture and evaluate the growth plate. A detailed patient history, including the mechanism of injury, is also important. The X-ray will show a fracture line extending through the growth plate and into the epiphysis, consistent with a Salter-Harris Type III pattern.

Treatment Options

• Immobilization: A cast or splint may be used to stabilize the arm during healing.
• Closed reduction: Manual realignment of the bone fragments without surgery, if the fracture is not significantly displaced.
• Surgical intervention: Required for displaced or unstable fractures to restore proper alignment and ensure proper healing of the growth plate and epiphysis.
• Treatment aims to preserve growth plate function and prevent long-term complications.

Prognosis and Follow-Up

Prognosis depends on the severity of the fracture and the accuracy of reduction. Most fractures heal well with appropriate treatment, but there is a risk of growth disturbance or joint deformity if the growth plate is damaged. Follow-up appointments are necessary to monitor healing and assess for any complications, such as limited range of motion or growth abnormalities.

Complications

• Growth plate damage leading to limb length discrepancy or angular deformity
• Joint stiffness or limited range of motion
• Avascular necrosis of the epiphysis (loss of blood supply to the bone end)
• Post-traumatic arthritis in the elbow joint

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports to reduce the risk of elbow injuries.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Follow rehabilitation guidelines to restore strength and mobility after healing.

When to Seek Professional Help

Seek immediate medical attention if there is severe pain, swelling, deformity, or inability to move the arm. Prompt evaluation is important to ensure proper diagnosis and treatment, especially in cases of suspected growth plate injury.

Tips for Medical Coders

This code (S49.131) specifies a Salter-Harris Type III physeal fracture of the lower end of the humerus, right arm. Documentation should clearly indicate the fracture type (Type III), location (lower end of humerus), and laterality (right arm). Ensure the medical record supports the specific fracture pattern and laterality to justify the code. Avoid using this code if the fracture type or laterality is not documented.