M91.12 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], left leg

Name of the Condition

• Juvenile Osteochondrosis of Head of Femur [Legg-Calve-Perthes], Left Leg

Summary

Juvenile osteochondrosis of the head of the femur, specifically affecting the left leg, is a pediatric condition involving temporary loss of blood supply to the femoral head. This disruption leads to bone fragmentation and potential deformity, progressing through stages of necrosis, reossification, and remodeling. Outcomes depend on severity and treatment, with the left hip being the specified site in this code.

Causes

The exact cause is not fully understood, but it is thought to result from disrupted blood flow to the femoral head, leading to avascular necrosis. Mechanical stress, genetic predisposition, and developmental factors may contribute to the disruption of blood supply.

Risk Factors

• Age: Most commonly affects children between 4 and 10 years old.
• Gender: More prevalent in males.
• Genetic factors: Family history may increase risk.
• Mechanical stress: Repetitive or excessive load on the hip.
• Laterality: This code specifies involvement of the left leg.

Symptoms

• Hip or groin pain, often worsened by activity, localized to the left side.
• Limping or altered gait favoring the left leg.
• Reduced range of motion in the left hip.
• Pain that may radiate to the left thigh or knee.
• In some cases, asymptomatic or mild discomfort.

Diagnosis

Diagnosis involves a physical examination to assess left hip mobility and pain, followed by imaging studies such as X-rays, MRI, or CT scans to evaluate the femoral head. Clinical history and symptom patterns are also considered to confirm the condition and rule out other causes.

Treatment Options

Treatment focuses on preserving the femoral head shape and hip function. Options may include activity modification, physical therapy, bracing, or surgical interventions like osteotomy, depending on severity. The goal is to minimize deformity and promote proper bone healing.

Prognosis and Follow-Up

Prognosis varies based on the extent of femoral head involvement and treatment adherence. Regular follow-up with imaging and clinical assessments is essential to monitor healing and adjust management. Long-term outcomes may include preserved hip function or potential arthritis in severe cases.

Complications

• Persistent hip pain or stiffness.
• Limited range of motion in the left hip.
• Development of degenerative arthritis in adulthood.
• Leg length discrepancy or gait abnormalities.

Lifestyle & Prevention

• Avoid high-impact activities that stress the left hip during active phases.
• Maintain a healthy weight to reduce mechanical load.
• Follow prescribed activity restrictions and physical therapy guidelines.
• Ensure regular follow-up to monitor progression and adjust care.

When to Seek Professional Help

Seek medical attention if persistent left hip pain, limping, or reduced mobility occurs, especially in children. Early evaluation is critical to prevent long-term complications and optimize treatment outcomes.

Tips for Medical Coders

Document the laterality (left leg) and confirm the condition aligns with juvenile osteochondrosis of the femoral head. Ensure clinical notes specify the affected side and any relevant imaging or treatment details to support accurate coding.