M91.10 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], unspecified leg

Name of the Condition

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

Summary

Juvenile osteochondrosis of the head of the femur, also known as Legg-Calvé-Perthes disease, is a condition affecting the growing hip joint in children. It involves temporary loss of blood supply to the femoral head, leading to bone fragmentation and potential deformity. The condition typically progresses through stages of necrosis, reossification, and remodeling, with outcomes varying based on severity and treatment.

Causes

The exact cause is not fully understood, but it is thought to result from disrupted blood flow to the femoral head, which may be triggered by genetic, vascular, or mechanical factors. The interruption of blood supply leads to avascular necrosis, followed by bone resorption and attempted repair.

Risk Factors

• Age: Most commonly affects children between 4 and 8 years old.
• Gender: More prevalent in males.
• Genetic factors: Family history may increase susceptibility.
• Mechanical stress: Repetitive or excessive load on the hip joint.

Symptoms

• Hip or groin pain, often intermittent and activity-related.
• Limping or altered gait.
• Reduced range of motion in the hip, particularly internal rotation.
• Pain that may radiate to the thigh or knee.
• In some cases, mild discomfort or asymptomatic presentation.

Diagnosis

Diagnosis involves a physical examination to assess hip mobility and pain, followed by imaging studies such as X-rays, MRI, or CT scans to evaluate femoral head integrity. Clinical history and progression of symptoms are also considered.

Treatment Options

• Activity modification: Reducing weight-bearing activities to minimize stress.
• Physical therapy: To maintain hip range of motion and muscle strength.
• Bracing or casting: To support the hip during healing.
• Surgical intervention: In severe cases, procedures like osteotomy or femoral osteotomy may be used to reshape the joint.

Prognosis and Follow-Up

Prognosis depends on the age of onset, severity of femoral head involvement, and treatment adherence. Younger children with less severe disease often have better outcomes. Regular follow-up with imaging and clinical assessments is necessary to monitor healing and joint function.

Complications

• Hip deformity: Persistent flattening or irregularity of the femoral head.
• Arthritis: Increased risk of osteoarthritis in adulthood.
• Limited mobility: Chronic stiffness or reduced range of motion.
• Leg length discrepancy: Potential growth-related differences.

Lifestyle & Prevention

• Avoid high-impact activities that stress the hip joint.
• Maintain a healthy weight to reduce joint load.
• Follow prescribed activity restrictions and physical therapy guidelines.
• Monitor for changes in gait or pain and report promptly.

When to Seek Professional Help

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

Tips for Medical Coders

Document the affected leg (unspecified in this code) and specify laterality if known. Include details of imaging findings, treatment plans, and clinical progression to support code assignment. Ensure documentation aligns with the clinical presentation of avascular necrosis or fragmentation of the femoral head.