S82.866A Nondisplaced Maisonneuve's fracture of unspecified leg, initial encounter for closed fracture

Name of the Condition

• Nondisplaced Maisonneuve's fracture of unspecified leg, initial encounter for closed fracture

Summary

A Maisonneuve's fracture is a specific type of ankle injury involving a proximal fibula fracture combined with a tear of the tibiofibular syndesmosis and often an associated medial malleolus or deltoid ligament injury. The term "nondisplaced" indicates that the fractured bone fragments remain aligned. This injury typically results from rotational forces applied to the ankle, leading to instability in the ankle joint. The "closed fracture" designation means the skin is intact, and "initial encounter" refers to the first episode of care for this injury.

Causes

The fracture is usually caused by external rotation of the foot, which can occur during activities like twisting the ankle, falls, or sports-related injuries. The rotational force disrupts the syndesmotic ligaments and may cause additional damage to the medial structures of the ankle.

Risk Factors

• Participation in activities with high rotational stress on the ankle, such as soccer or basketball.
• Previous ankle injuries or ligamentous instability.
• Improper footwear or uneven terrain increasing fall risk.

Symptoms

• Pain and swelling localized to the proximal fibula and ankle.
• Difficulty bearing weight on the affected leg.
• Instability or a feeling of the ankle "giving way."
• Bruising or tenderness along the lower leg.

Diagnosis

Diagnosis involves a physical examination to assess ankle stability, tenderness, and swelling. Imaging, typically X-rays, is used to identify the proximal fibula fracture and associated injuries. Additional imaging, such as CT or MRI, may be required to evaluate soft tissue damage or confirm syndesmotic involvement.

Treatment Options

Treatment depends on the severity of the injury and associated ligament damage. Nondisplaced fractures may be managed with immobilization (e.g., casting or bracing) and non-weight-bearing status. Surgical intervention may be necessary if there is significant syndesmotic instability or associated fractures. Physical therapy is often recommended to restore strength and mobility.

Prognosis and Follow-Up

With appropriate treatment, most patients recover fully, though recovery time may vary. Follow-up care typically includes monitoring for healing and gradual return to weight-bearing activities. Physical therapy is often recommended to restore strength and mobility. Long-term outcomes depend on the extent of ligamentous damage and adherence to rehabilitation.

Complications

• Chronic ankle instability or recurrent sprains.
• Post-traumatic arthritis due to joint damage.
• Delayed union or nonunion of the fibula fracture.
• Nerve or vascular injury in severe cases.

Lifestyle & Prevention

• Wear supportive footwear appropriate for activities.
• Use ankle braces or tape during high-risk sports.
• Improve ankle strength and proprioception through exercises.
• Avoid uneven surfaces or hazardous environments that increase fall risk.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, inability to bear weight, visible deformity, or signs of infection (e.g., redness, fever). Persistent swelling, instability, or difficulty walking after an injury should also prompt evaluation.

Tips for Medical Coders

Document the fracture location (unspecified leg), displacement status (nondisplaced), encounter type (initial), and fracture type (closed) to accurately assign S82.866A. Ensure clinical notes specify the absence of displacement and confirm the injury is closed. Include details about associated ligament or malleolar injuries if present, as these may impact coding specificity.