M93.02 Chronic slipped upper femoral epiphysis (nontraumatic)

Name of the Condition

• Chronic slipped upper femoral epiphysis (nontraumatic)

Summary

Chronic slipped upper femoral epiphysis (SUFE) is a condition where the femoral head (ball of the hip joint) gradually slips from its normal position on the femoral neck due to a fracture through the growth plate. This nontraumatic form develops over time without a specific injury and typically affects adolescents during growth spurts. The condition can lead to persistent hip pain, gait abnormalities, and reduced mobility if left untreated.

Causes

The exact cause of chronic nontraumatic SUFE is not fully understood, but it is associated with mechanical stress on the growth plate during rapid growth. Hormonal changes, particularly those affecting growth plate stability, may contribute. Obesity is a key factor due to increased mechanical load on the hip, which can weaken the growth plate over time. The chronic nature suggests a slow, progressive displacement rather than a sudden event.

Risk Factors

• Age: Most common in adolescents aged 10-16 years, especially during growth spurts.
• Gender: Males are more frequently affected than females.
• Obesity: Higher body weight increases stress on the hip joint.
• Endocrine disorders: Conditions like hypothyroidism or growth hormone abnormalities may elevate risk.
• Family history: A genetic predisposition may play a role in some cases.

Symptoms

• Persistent hip, thigh, or knee pain (pain may be referred to the knee).
• Chronic limp or altered gait (e.g., walking with a toe-out stance).
• Reduced range of motion in the affected hip, particularly internal rotation.
• Mild to moderate discomfort that worsens with activity or weight-bearing.
• Possible leg length discrepancy over time.

Diagnosis

Diagnosis involves a physical exam to assess hip mobility, gait, and pain patterns. Imaging studies, such as X-rays or MRI, are used to confirm the slip and evaluate the severity. The chronic nature may be identified by the gradual onset of symptoms and imaging findings consistent with long-standing displacement. Additional tests may be ordered to rule out underlying endocrine or metabolic conditions.

Treatment Options

Treatment focuses on stabilizing the femoral head to prevent further slipping. Options include:

• Surgical fixation: Pins or screws are used to secure the femoral head to the neck, allowing the growth plate to heal.
• Activity modification: Reducing weight-bearing activities to alleviate stress on the hip.
• Pain management: NSAIDs or other medications to control discomfort.
• Monitoring: Regular follow-up imaging to assess healing and detect complications.

Prognosis and Follow-Up

With early diagnosis and appropriate treatment, most patients recover well, though some may experience long-term hip stiffness or arthritis. Follow-up care is essential to monitor for complications, such as avascular necrosis (loss of blood supply to the femoral head) or chondrolysis (cartilage damage). Physical therapy may be recommended to restore mobility and strength.

Complications

• Avascular necrosis: Reduced blood flow to the femoral head, potentially leading to bone death.
• Chondrolysis: Degeneration of the hip joint cartilage, causing pain and stiffness.
• Arthritis: Long-term joint damage requiring future intervention.
• Leg length discrepancy: Unequal limb lengths due to growth plate disruption.

Lifestyle & Prevention

• Maintain a healthy weight to reduce hip stress.
• Engage in regular, low-impact exercise to support joint health.
• Avoid high-impact activities that strain the hip.
• Monitor growth-related changes in adolescents, especially those with risk factors.

When to Seek Professional Help

Seek medical attention if you or your child experiences persistent hip or knee pain, a noticeable limp, or difficulty walking. Early evaluation is critical to prevent progression and complications.

Tips for Medical Coders

Document the chronic nature of the condition, including the duration of symptoms and any imaging findings confirming gradual displacement. Note whether the slip is stable or unstable, as this may impact coding specificity. Ensure documentation supports the nontraumatic etiology, as this distinguishes it from traumatic causes. Include details about treatment approaches (e.g., surgical fixation) and any associated complications for accurate code assignment.