M93.021 Chronic slipped upper femoral epiphysis (nontraumatic), right hip

Name of the Condition

• Chronic slipped upper femoral epiphysis (nontraumatic), right hip

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 slowly without a specific injury and typically affects adolescents during growth spurts. The chronic nature implies a prolonged or persistent displacement, which may lead to hip pain, stiffness, or gait changes. Prompt evaluation is important to prevent complications.

Causes

The exact cause of chronic nontraumatic SUFE is not fully understood, but it is thought to result from mechanical stress on the growth plate combined with hormonal influences during puberty. Reduced blood flow to the growth plate may weaken the bone, allowing the femoral head to slip gradually. Obesity is also considered a contributing factor due to increased mechanical load on the hip. The chronic presentation suggests a slow, progressive displacement over time.

Risk Factors

• Age: Most common in adolescents aged 10-16 years, particularly during rapid 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.

Symptoms

• Hip, thigh, or knee pain (pain may be referred to the knee).
• Limp or altered gait (e.g., walking with a limp or toe-out stance).
• Reduced range of motion in the hip, especially internal rotation.
• External rotation of the leg when flexed.
• Pain worsened by activity or weight-bearing.

Diagnosis

Diagnosis involves a physical exam to assess hip range of motion, gait, and pain patterns. Imaging studies, such as X-rays or MRI, are typically used to confirm the slipped femoral head and evaluate the degree of displacement. The chronic nature may be identified by the presence of remodeling or adaptive changes in the growth plate.

Treatment Options

Treatment depends on the severity of the slip and may include:

• Observation: For mild cases with minimal displacement.
• Surgical fixation: To stabilize the femoral head and prevent further slipping, often using pins or screws.
• Activity modification: Reducing weight-bearing activities to alleviate pain.
• Physical therapy: To improve hip mobility and strength.

Prognosis and Follow-Up

With appropriate treatment, most patients recover well, but chronic SUFE may increase the risk of long-term hip problems, such as arthritis. Regular follow-up with an orthopedic specialist is recommended to monitor hip function and address any complications. Early intervention improves outcomes.

Complications

• Avascular necrosis: Reduced blood flow to the femoral head, potentially leading to bone death.
• Osteoarthritis: Premature wear and tear of the hip joint.
• Gait abnormalities: Persistent limping or altered walking patterns.
• Leg length discrepancy: Unequal leg lengths due to growth plate damage.

Lifestyle & Prevention

• Maintain a healthy weight to reduce stress on the hip joint.
• Engage in regular, low-impact exercise to support hip strength and flexibility.
• Avoid high-impact activities that strain the hip during growth spurts.
• Monitor for symptoms and seek prompt evaluation if hip pain or gait changes occur.

When to Seek Professional Help

Seek medical attention if you or your child experiences:

• Persistent hip, thigh, or knee pain.
• A noticeable limp or difficulty walking.
• Reduced hip mobility or stiffness.
• Sudden worsening of symptoms.

Tips for Medical Coders

Document the laterality (right hip) and chronic nature of the condition clearly in the medical record. Ensure the diagnosis is supported by clinical findings and imaging results. The code M93.021 specifies chronic, nontraumatic slipped upper femoral epiphysis of the right hip; documentation should reflect the chronicity and anatomical location to justify the code assignment.