M93.012 Acute slipped upper femoral epiphysis (nontraumatic), left hip

Name of the Condition

• Acute slipped upper femoral epiphysis (nontraumatic), left hip

Summary

Acute slipped upper femoral epiphysis (SUFE) is a condition where the femoral head (ball of the hip joint) shifts from its normal position on the femoral neck due to a fracture through the growth plate. This nontraumatic form occurs without a specific injury and typically presents acutely in adolescents during growth spurts. The left hip is specifically affected, and the acute nature indicates a recent onset of symptoms.

Causes

The exact cause of acute 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. Obesity is also considered a contributing factor due to increased mechanical load on the hip.

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.
• Prior SUFE: A history of SUFE in the contralateral hip increases the risk of acute onset in the other hip.

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 tenderness. Imaging studies, such as X-rays or MRI, are typically used to confirm the displacement of the femoral head. The acute nature of the condition may be identified by the sudden onset of symptoms and imaging findings.

Treatment Options

Treatment usually involves surgical stabilization to prevent further slippage and restore alignment. This may include in-situ pinning or other fixation methods. Postoperative care often includes activity modification and physical therapy to restore mobility and strength. In some cases, close monitoring of the contralateral hip is recommended.

Prognosis and Follow-Up

With prompt treatment, the prognosis for acute SUFE is generally favorable, but complications such as avascular necrosis or chronic pain can occur. Long-term follow-up is important to monitor for growth disturbances or degenerative changes. Regular check-ups and imaging may be needed to assess hip function and alignment.

Complications

• Avascular necrosis of the femoral head.
• Chronic hip pain or stiffness.
• Gait abnormalities or leg length discrepancy.
• Early-onset osteoarthritis in the affected hip.

Lifestyle & Prevention

Maintaining a healthy weight can reduce stress on the hip joint. Regular physical activity, balanced with rest during growth spurts, may help. Early recognition of symptoms (e.g., hip or knee pain, limping) and prompt medical evaluation are key to preventing progression.

When to Seek Professional Help

Seek medical attention if there is sudden or worsening hip pain, limping, or difficulty bearing weight. Acute symptoms, especially in adolescents, require urgent evaluation to avoid complications.

Tips for Medical Coders

Use M93.012 for acute nontraumatic slipped upper femoral epiphysis of the left hip. Document the acute nature of the condition and the specific hip involved. Ensure clinical notes support the diagnosis and exclude traumatic causes to justify the nontraumatic code.