S79.142A Salter-Harris Type IV physeal fracture of lower end of left femur, initial encounter for closed fracture

Name of the Condition

Salter-Harris Type IV physeal fracture of lower end of left femur, initial encounter for closed fracture

Summary

A Salter-Harris Type IV physeal fracture of the lower end of the left femur is an injury involving the growth plate (physis) at the distal femur, typically occurring in children or adolescents. This fracture disrupts the physis, which is the area of developing bone responsible for longitudinal growth. The injury specifically involves a fracture that extends through the metaphysis, across the physis, and into the epiphysis, as defined by the Salter-Harris classification system. This type of fracture may disrupt both growth and joint alignment due to its complex nature. The "initial encounter" and "closed fracture" descriptors indicate this is the first presentation of the injury without an open wound or exposure of the fracture site.

Causes

Salter-Harris Type IV physeal fractures of the lower femur are usually caused by acute trauma, such as falls, sports-related injuries, or direct blows to the knee or thigh. The force transmitted across the growth plate can cause it to separate from the adjacent bone, with the fracture line extending through multiple bone regions. In some cases, repetitive stress or overuse may contribute to the injury, particularly in active children or adolescents.

Risk Factors

• Age: Most common in children and adolescents, as growth plates are weaker than surrounding bone.
• Activity level: Participation in high-impact sports or activities with a risk of falls (e.g., gymnastics, soccer, skateboarding).
• Growth spurts: Periods of rapid growth may temporarily weaken the physis, increasing susceptibility to injury.
• Anatomical factors: Variations in bone structure or alignment may predispose to injury.

Symptoms

• Pain and swelling at the knee or thigh, particularly around the growth plate area.
• Limited range of motion in the affected leg.
• Visible deformity or misalignment of the limb.
• Difficulty bearing weight or walking.
• Tenderness to touch over the fracture site.

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and deformity. Imaging studies, such as X-rays, are used to confirm the fracture type and extent. The Salter-Harris classification system is applied to determine the fracture pattern, and additional imaging (e.g., MRI) may be used to evaluate soft tissue involvement or growth plate damage. Clinical history, including the mechanism of injury, is also considered.

Treatment Options

Treatment depends on the severity and displacement of the fracture. Nonsurgical options include immobilization with a cast or brace to allow healing. Surgical intervention may be necessary for displaced fractures to realign bone fragments and stabilize the growth plate. Post-treatment, physical therapy is often recommended to restore mobility and strength. Close monitoring of growth and alignment is essential during recovery.

Prognosis and Follow-Up

Prognosis varies based on the fracture's severity and treatment. Early intervention generally improves outcomes, but there is a risk of growth disturbances or joint alignment issues. Follow-up appointments are necessary to monitor healing, assess growth plate function, and adjust treatment as needed. Long-term monitoring may be required to detect potential complications.

Complications

• Growth disturbances: Disruption of the growth plate may lead to limb length discrepancies or angular deformities.
• Joint instability: Misalignment can affect knee function and increase the risk of arthritis.
• Nonunion or malunion: Incomplete healing or improper alignment of the fracture.
• Infection: Rare but possible, especially if surgical intervention is required.

Lifestyle & Prevention

• Use protective gear during high-impact activities (e.g., helmets, pads).
• Ensure proper training and technique in sports to reduce injury risk.
• Maintain a balanced diet rich in calcium and vitamin D to support bone health.
• Avoid overuse or repetitive stress on the lower limbs in growing children.

When to Seek Professional Help

Seek immediate medical attention if there is severe pain, swelling, deformity, or inability to bear weight after an injury. Prompt evaluation is critical to prevent complications and ensure appropriate treatment.

Tips for Medical Coders

When coding for this condition, ensure the documentation specifies the Salter-Harris Type IV classification, the location (lower end of left femur), and the encounter type (initial) and fracture status (closed). Verify that the medical record supports these details to accurately reflect the diagnosis and treatment.