S79.122K Salter-Harris Type II physeal fracture of lower end of left femur, subsequent encounter for fracture with nonunion

Name of the Condition

Salter-Harris Type II physeal fracture of lower end of left femur, subsequent encounter for fracture with nonunion

Summary

A Salter-Harris Type II 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 and includes a metaphyseal fragment, as defined by the Salter-Harris classification system. The term "subsequent encounter" indicates this is a follow-up visit for the fracture, and "nonunion" means the fracture has failed to heal within the expected timeframe, requiring ongoing management.

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, often with a small piece of the metaphysis attached. Nonunion may result from inadequate immobilization, poor blood supply, or excessive movement at the fracture site during healing.

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).
• Delayed or inadequate treatment: Improper immobilization or insufficient follow-up care can increase the risk of nonunion.
• Underlying conditions: Certain metabolic or vascular disorders may impair healing.

Symptoms

• Persistent pain at the fracture site, often worsening with activity.
• Swelling or tenderness around the knee or thigh.
• Limited range of motion in the affected leg.
• Visible deformity or instability in severe cases.
• Failure of symptoms to improve over time, despite prior treatment.

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays or MRI, are used to evaluate the fracture site and confirm nonunion. X-rays may show a persistent gap or sclerosis at the fracture line, indicating failed healing. Clinical correlation with the patient’s history of injury and treatment is essential to confirm the diagnosis.

Treatment Options

Treatment focuses on promoting healing and may include:

• Prolonged immobilization with a cast or brace to stabilize the fracture.
• Surgical intervention, such as internal fixation with pins or screws, to realign and stabilize the bone.
• Bone grafting to stimulate healing in cases of significant nonunion.
• Physical therapy to restore strength and mobility once healing progresses.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and the effectiveness of treatment. With appropriate management, many patients achieve healing and return to normal function, though some may experience long-term stiffness or growth disturbances. Regular follow-up with imaging is necessary to monitor progress and adjust treatment as needed.

Complications

• Chronic pain or discomfort.
• Limb length discrepancy due to impaired growth.
• Arthritis or joint stiffness.
• Need for additional surgeries if nonunion persists.
• Reduced mobility or functional limitations.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Follow immobilization and weight-bearing instructions strictly.
• Engage in low-impact exercises, such as swimming, to maintain mobility without stressing the fracture.
• Ensure adequate nutrition, including calcium and vitamin D, to support bone health.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Sudden increase in pain, swelling, or deformity.
• Inability to bear weight on the affected leg.
• Signs of infection, such as redness, warmth, or fever.
• Persistent symptoms without improvement after initial treatment.

Tips for Medical Coders

Document the encounter as a "subsequent" visit for a fracture with nonunion. Ensure clinical notes specify the fracture type (Salter-Harris II), location (lower end of left femur), and the presence of nonunion. Include details on treatment provided and any imaging results to support the diagnosis.