S79.122 Salter-Harris Type II physeal fracture of lower end of left femur

Name of the Condition

Salter-Harris Type II physeal fracture of lower end of left femur

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, 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.

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 spurts: Periods of rapid growth may temporarily weaken the physis, increasing susceptibility to injury.
• Anatomical factors: Variations in bone structure or growth plate strength may influence risk.

Symptoms

• Pain localized to the knee or thigh, often worsening with movement or weight-bearing.
• Swelling and tenderness around the affected area.
• Limited range of motion in the knee joint.
• Visible deformity or abnormal positioning of the leg in severe cases.
• Inability to bear weight on the affected limb.

Diagnosis

Diagnosis is typically made through a combination of clinical evaluation and imaging studies. A physical examination assesses pain, swelling, and range of motion. Radiographic imaging, such as X-rays, is used to visualize the fracture and confirm the Salter-Harris Type II pattern, which includes a metaphyseal fragment. In some cases, advanced imaging like MRI may be used to evaluate soft tissue involvement or assess growth plate integrity.

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 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

Prognosis is generally favorable with appropriate treatment, though outcomes depend on the extent of growth plate involvement and potential for growth disturbance. Regular follow-up with imaging is important to monitor healing and assess for complications like growth arrest. Long-term monitoring may be necessary to ensure normal limb development.

Complications

• Growth disturbance: Potential for uneven limb length or angular deformity due to growth plate damage.
• Nonunion or malunion: Incomplete healing or improper alignment of the fracture.
• Joint stiffness or reduced mobility.
• Chronic pain or functional limitations.

Lifestyle & Prevention

• Use protective gear during high-impact sports or activities.
• Ensure proper technique and training to reduce injury risk.
• Maintain overall bone health through balanced nutrition and regular exercise.
• Avoid overuse or repetitive stress on the knee and thigh.

When to Seek Professional Help

Seek immediate medical attention if there is severe pain, inability to move the leg, visible deformity, or signs of infection (e.g., fever, increased swelling, redness). Prompt evaluation is critical to prevent complications and ensure proper treatment.

Tips for Medical Coders

When coding for S79.122, ensure documentation specifies the left femur, the Salter-Harris Type II classification, and the anatomical location (lower end of femur). Include details about fracture characteristics (e.g., closed vs. open, displacement) and encounter type (e.g., initial, subsequent) as applicable. Verify that the fracture is clearly differentiated from other Salter-Harris types to support accurate coding.