M93.013 Acute slipped upper femoral epiphysis (nontraumatic), unspecified hip

Name of the Condition

• Acute slipped upper femoral epiphysis (nontraumatic), unspecified 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 presents acutely, meaning symptoms develop suddenly. The condition primarily affects adolescents during growth spurts and can lead to hip pain, stiffness, or gait changes. Prompt evaluation is important to prevent complications.

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. The acute presentation suggests a sudden displacement, possibly due to cumulative stress or a minor, unrecognized event.

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 movement, pain, and gait. 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 require urgent evaluation to rule out complications like avascular necrosis.

Treatment Options

Treatment focuses on stabilizing the femoral head to prevent further slipping. This often involves surgical fixation, such as pinning, to align the bone. Non-surgical options, like activity modification and pain management, may be considered in mild cases, but surgery is usually preferred for acute presentations to reduce long-term risks.

Prognosis and Follow-Up

With prompt treatment, outcomes are generally favorable, but complications like avascular necrosis or arthritis can occur. Follow-up care includes monitoring for hip function, pain, and growth plate healing. Long-term follow-up may be necessary to assess for late complications.

Complications

• Avascular necrosis (loss of blood supply to the femoral head).
• Early-onset arthritis in the hip joint.
• Chronic pain or limited mobility.
• Gait abnormalities if untreated.

Lifestyle & Prevention

Maintaining a healthy weight during adolescence may reduce stress on the hip joint. Regular physical activity and avoiding excessive strain on the hips can help, though prevention is limited due to the condition’s association with growth and hormonal changes.

When to Seek Professional Help

Seek immediate medical attention if sudden hip or knee pain, limping, or difficulty bearing weight occurs, especially in adolescents. Early evaluation can prevent progression and complications.

Tips for Medical Coders

Document the acute nature of the condition and specify the hip involvement (unspecified in this code). Include details on presentation, imaging findings, and treatment to support accurate coding. Ensure documentation aligns with the nontraumatic, acute classification for M93.013.