S79.129S Salter-Harris Type II physeal fracture of lower end of unspecified femur, sequela

Name of the Condition

Salter-Harris Type II physeal fracture of lower end of unspecified femur, sequela

Summary

A Salter-Harris Type II physeal fracture of the lower end of the unspecified 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 separation of the growth plate with a fracture through the metaphysis, as defined by the Salter-Harris classification system. The fracture line extends from the physis into the metaphysis, distinguishing it from Type I fractures. The "sequela" designation indicates this code is used for complications or conditions resulting from the fracture, rather than the acute injury itself.

Causes

Salter-Harris Type II 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 extending into the metaphysis. 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 plate vulnerability: The physis is a weaker structure compared to mature bone, making it more susceptible to injury during periods of rapid growth.

Symptoms

• Pain and swelling at the fracture site, often localized to the knee or thigh.
• Limited range of motion in the affected leg.
• Visible deformity or abnormal positioning of the limb.
• Difficulty bearing weight or walking.
• Possible numbness or tingling if nerve involvement occurs.

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays, are used to confirm the fracture type and location. The Salter-Harris classification system helps differentiate Type II fractures from other growth plate injuries. Additional imaging, like MRI or CT scans, may be ordered if the fracture is complex or if there is suspicion of associated soft tissue damage.

Treatment Options

Treatment depends on the severity and displacement of the fracture. Non-displaced fractures may be managed with immobilization using a cast or brace. Displaced fractures often require closed reduction (realignment without surgery) or, in some cases, surgical intervention to stabilize the bone. Physical therapy is commonly recommended during recovery to restore strength and mobility.

Prognosis and Follow-Up

Prognosis varies based on the fracture's severity and treatment. Most Salter-Harris Type II fractures heal well with appropriate care, but there is a risk of growth disturbances or long-term joint issues if the physis is damaged. Follow-up appointments are essential to monitor healing and assess for complications, such as limb length discrepancy or angular deformity.

Complications

• Growth plate damage leading to limb length discrepancy or abnormal bone growth.
• Joint stiffness or reduced range of motion.
• Chronic pain or arthritis in the affected joint.
• Nerve or blood vessel injury, though rare.
• Malunion or nonunion of the fracture.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports (e.g., knee pads, helmets).
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Gradually return to activity under medical supervision to prevent re-injury.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, inability to bear weight, visible deformity, or signs of infection (e.g., fever, redness, swelling). Follow up with a healthcare provider if symptoms worsen or do not improve with initial treatment.

Tips for Medical Coders

This code is used for sequelae (late effects) of a Salter-Harris Type II physeal fracture of the lower femur. Documentation should specify the nature of the sequela, such as chronic pain, growth disturbance, or joint dysfunction. Ensure the fracture is clearly linked to the sequela in the medical record to support accurate coding.