S49.129 Salter-Harris Type II physeal fracture of lower end of humerus, unspecified arm

Name of the Condition

• Salter-Harris Type II physeal fracture of lower end of humerus, unspecified arm (ICD-10 Code: S49.129)

Summary

This code describes a Salter-Harris Type II fracture involving the growth plate (physeal) at the lower end of the humerus, with a fragment of the metaphysis (the portion of the bone adjacent to the growth plate). This type of injury is common in children and adolescents due to the relative weakness of the growth plate compared to surrounding bone. The fracture typically affects the distal humeral physis, where the upper arm bone meets the elbow joint, and the unspecified arm designation indicates the side is not documented.

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 contact sports or activities involving forceful arm movement, are frequent mechanisms. The force applied to the elbow can disrupt the growth plate and pull a small piece of the metaphysis with it.

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 typically involves a physical examination to assess pain, swelling, and range of motion, followed by imaging studies such as X-rays to visualize the fracture. The Salter-Harris classification system is used to identify the fracture type, and additional imaging (e.g., MRI or CT) may be ordered if the fracture is not clearly visible on X-rays or to assess for associated injuries.

Treatment Options

Treatment depends on the severity and displacement of the fracture. Nonsurgical options include immobilization with a cast or splint to allow healing. Surgical intervention may be required for significantly displaced fractures, involving realignment and fixation with pins or screws. Physical therapy is often recommended during recovery to restore strength and mobility.

Prognosis and Follow-Up

Most Salter-Harris Type II fractures heal well with appropriate treatment, especially when diagnosed early. Long-term prognosis is generally favorable, but follow-up care is important to monitor for growth disturbances or joint function issues. Regular check-ups with an orthopedic specialist may be necessary to assess healing and address any complications.

Complications

Potential complications include growth plate damage leading to limb length discrepancies or angular deformities, joint stiffness, or arthritis. Incomplete healing or malunion can also occur, requiring additional treatment. Rarely, nerve or blood vessel injury may accompany the fracture.

Lifestyle & Prevention

Preventive measures include using proper protective equipment during sports, avoiding high-risk activities without supervision, and ensuring safe play environments. Strengthening exercises for the arm and elbow may help reduce injury risk. Prompt treatment of minor injuries can prevent progression to more severe fractures.

When to Seek Professional Help

Seek immediate medical attention if there is severe pain, visible deformity, inability to move the arm, or signs of nerve or vascular compromise (e.g., numbness, coldness). Persistent pain, swelling, or limited mobility after an injury also warrants evaluation by a healthcare provider.

Tips for Medical Coders

This code (S49.129) is specific to a Salter-Harris Type II physeal fracture of the lower humerus with an unspecified arm. Documentation should clearly indicate the fracture type, location, and absence of side specification. Ensure the medical record supports the unspecified arm designation, as more specific codes (e.g., right or left) are available when documented. Verify that the fracture is classified as Type II using the Salter-Harris system to avoid miscoding.