M87.35 Other secondary osteonecrosis, pelvis and femur

Name of the Condition

• Other secondary osteonecrosis, pelvis and femur
• Also known as secondary avascular necrosis of the pelvis and femur due to identifiable causes.

Summary

Other secondary osteonecrosis of the pelvis and femur is a condition where bone tissue death occurs due to disrupted blood flow, secondary to underlying causes other than trauma, drugs, or idiopathic factors. This can lead to bone collapse, joint damage, and functional impairment in the hip and pelvic region.

Causes

The condition results from reduced blood supply to bone tissue, triggered by underlying factors such as systemic diseases, vascular disorders, or other specified conditions. The specific mechanism depends on the associated cause, which may include conditions affecting blood flow to the pelvis or femur.

Risk Factors

• Systemic conditions (e.g., lupus, Gaucher disease)
• Vascular disorders affecting bone perfusion
• Radiation therapy near the pelvis or femur
• Prolonged corticosteroid use (if not classified under drug-induced osteonecrosis)
• Excessive alcohol consumption
• Blood disorders (e.g., sickle cell disease)
• Prior hip or pelvic surgery

Symptoms

• Hip or groin pain that worsens with activity and may persist at rest
• Limited range of motion in the hip joint
• Stiffness or swelling around the hip
• Limping (due to weight-bearing joint involvement)
• Pain radiating to the thigh or buttock

Diagnosis

Diagnosis involves clinical evaluation and imaging. X-rays may show late-stage changes, while MRI or CT scans detect early bone damage. Bone scans assess blood flow to the affected area, and a thorough medical history helps identify underlying causes.

Treatment Options

• Pain management with medications (e.g., NSAIDs)
• Physical therapy to maintain joint mobility
• Weight-bearing restrictions to reduce stress on the hip
• Surgical options (e.g., core decompression, joint replacement) for advanced cases
• Management of underlying conditions (e.g., controlling lupus or blood disorders)

Prognosis and Follow-Up

Prognosis depends on the extent of bone damage and timely intervention. Early diagnosis and treatment can preserve joint function, but advanced cases may require surgery. Regular follow-up with imaging and clinical assessments is recommended to monitor progression.

Complications

• Joint collapse and arthritis
• Chronic pain and disability
• Reduced mobility and quality of life
• Need for surgical intervention (e.g., hip replacement)

Lifestyle & Prevention

• Avoid excessive alcohol consumption
• Manage underlying conditions (e.g., lupus, blood disorders)
• Use corticosteroids cautiously under medical supervision
• Maintain a healthy weight to reduce hip stress
• Engage in low-impact exercise to preserve joint function

When to Seek Professional Help

Seek medical attention if you experience persistent hip pain, difficulty walking, or swelling around the hip. Early evaluation is critical to prevent irreversible bone damage.

Tips for Medical Coders

Document the specific site (pelvis and femur) and underlying cause when available. Ensure the code aligns with clinical findings and excludes primary or idiopathic osteonecrosis. Verify that secondary causes are clearly identified in the medical record to support accurate coding.