S79.132K Salter-Harris Type III physeal fracture of lower end of left femur, subsequent encounter for fracture with nonunion

Name of the Condition

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

Summary

A Salter-Harris Type III 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 extends through the epiphysis, as defined by the Salter-Harris classification system. The injury involves a fracture line that passes through the growth plate and into the joint surface, potentially affecting the articular cartilage. The term "subsequent encounter" indicates this is a follow-up visit for treatment, and "nonunion" means the fracture has failed to heal properly after an expected period.

Causes

Salter-Harris Type III 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 and extend into the epiphysis. In some cases, repetitive stress or overuse may contribute to the injury, particularly in active children or adolescents. Nonunion may result from inadequate immobilization, poor blood supply to the fracture site, or excessive movement 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).
• Growth spurts: Periods of rapid growth may temporarily weaken the physis, increasing susceptibility to injury.
• Anatomical factors: Variations in bone structure or growth plate alignment.
• Delayed or inadequate treatment: Improper immobilization or insufficient follow-up care.

Symptoms

• Persistent pain at the fracture site, often worsening with activity.
• Swelling and tenderness around the knee or thigh.
• Limited range of motion in the affected leg.
• Visible deformity or abnormal alignment of the limb.
• Difficulty bearing weight or walking.
• Possible clicking or grinding sensations during movement.

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays or MRI, are used to confirm the fracture type and assess for nonunion. X-rays may show a persistent fracture line with no signs of healing, while MRI can evaluate soft tissue damage and blood supply. The healthcare provider will also review the patient's history, including prior treatment and time since injury, to determine the appropriate course of action.

Treatment Options

Treatment for nonunion may include surgical intervention to realign and stabilize the fracture, such as internal fixation with screws or plates. Bone grafting may be necessary to promote healing. Post-surgery, immobilization with a cast or brace is often required, followed by physical therapy to restore strength and mobility. In some cases, non-surgical approaches like electrical stimulation or ultrasound therapy may be used to encourage bone growth.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and the effectiveness of treatment. With proper intervention, many patients achieve successful healing and restored function. Follow-up appointments are essential to monitor progress, typically involving repeat imaging to assess bone union. Long-term outcomes may include a slight risk of growth disturbances or arthritis, particularly if the joint surface was involved.

Complications

• Delayed or impaired bone growth, potentially leading to limb length discrepancy.
• Chronic pain or stiffness in the knee or hip.
• Post-traumatic arthritis due to joint surface damage.
• Infection or hardware-related issues if surgery is performed.
• Reduced mobility or functional limitations.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports or recreational activities.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Follow prescribed rehabilitation plans to optimize healing.
• Attend all follow-up appointments to monitor progress.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, swelling, or deformity after an injury. For follow-up care, consult a healthcare provider if symptoms worsen, or if you notice persistent pain, difficulty moving, or signs of infection (e.g., redness, fever). Early intervention is critical for addressing nonunion and preventing long-term complications.

Tips for Medical Coders

When coding S79.132K, ensure documentation supports the subsequent encounter for fracture with nonunion. The code requires confirmation of a prior Salter-Harris Type III physeal fracture of the lower left femur and evidence of nonunion, such as imaging reports or clinical notes indicating failed healing. Verify that the encounter is for treatment of the nonunion, not an initial injury or routine follow-up without complications.