S82.865C Nondisplaced Maisonneuve's fracture of left leg, initial encounter for open fracture type IIIA, IIIB, or IIIC

Name of the Condition

• Nondisplaced Maisonneuve's fracture of left leg, initial encounter for open fracture type IIIA, IIIB, or IIIC
• ICD-10 Code: S82.865C

Summary

A Maisonneuve's fracture is a specific type of ankle injury involving a fracture of the proximal fibula (upper portion of the smaller lower leg bone) combined with a tear of the syndesmotic ligaments and often an associated injury to the medial malleolus or deltoid ligament. The term "nondisplaced" indicates that the fractured bone fragments remain aligned. This injury typically results from rotational forces applied to the ankle, commonly seen in trauma such as falls or sports injuries. The "open fracture" designation indicates that the fracture communicates with the external environment, classified as type IIIA, IIIB, or IIIC based on the severity of soft tissue damage and contamination.

Causes

The fracture is caused by external rotational forces applied to the ankle, often during activities that involve twisting or turning. Common scenarios include falls, motor vehicle accidents, or sports-related impacts where the foot is planted and the body rotates forcefully. The mechanism typically involves the talus rotating outward, stressing the syndesmotic ligaments and causing the proximal fibula to fracture. The open nature of the fracture suggests significant trauma that has breached the skin or underlying tissues.

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.
• Age-related factors that may affect bone density or ligament integrity.
• High-energy trauma events, such as motor vehicle collisions or falls from height.

Symptoms

• Severe pain and swelling localized to the proximal fibula and ankle.
• Difficulty bearing weight on the affected leg.
• Visible wound or open area at the fracture site (indicating an open fracture).
• Bruising or tenderness along the lower leg.
• Instability or a feeling of the ankle "giving way."
• Possible signs of infection or tissue damage in open fractures.

Diagnosis

Diagnosis involves a physical examination to assess ankle stability, tenderness, and swelling, with careful evaluation of any open wounds. Imaging, typically X-rays, is used to identify the proximal fibula fracture and associated injuries. Additional imaging, such as CT scans, may be required to assess the extent of soft tissue damage or bone displacement. The classification of the open fracture (IIIA, IIIB, or IIIC) is determined by the severity of the wound, contamination, and soft tissue injury.

Treatment Options

Treatment focuses on stabilizing the fracture and managing the open wound. Nondisplaced fractures may be managed with immobilization (e.g., casting or bracing) and close monitoring. Open fractures require urgent surgical intervention to clean the wound, reduce the fracture, and stabilize the bones (e.g., with plates or screws). Antibiotics are typically administered to prevent infection, and tetanus status is assessed. Postoperative care includes wound management and rehabilitation to restore function.

Prognosis and Follow-Up

Prognosis depends on the severity of the fracture, the success of treatment, and the presence of complications. Nondisplaced fractures generally have a favorable outcome with proper immobilization and rehabilitation. Open fractures carry a higher risk of infection or delayed healing, requiring closer monitoring. Follow-up appointments are essential to assess healing, monitor for infection, and guide rehabilitation. Long-term follow-up may be needed to evaluate ankle stability and function.

Complications

• Infection, particularly in open fractures.
• Delayed union or nonunion of the fracture.
• Chronic ankle instability or pain.
• Nerve or vascular damage due to the injury or surgery.
• Post-traumatic arthritis in the ankle joint.

Lifestyle & Prevention

• Wear appropriate footwear for activities, especially those involving rotational stress.
• Use protective gear during high-risk sports (e.g., ankle braces).
• Maintain good bone health through diet and exercise to reduce fracture risk.
• Avoid uneven or slippery surfaces that increase fall risk.
• Seek prompt treatment for ankle injuries to prevent progression to more severe fractures.

When to Seek Professional Help

Seek immediate medical attention if you experience severe ankle pain, swelling, or an open wound after trauma. Signs of infection (e.g., redness, pus, fever) or worsening pain should also prompt urgent evaluation. Difficulty bearing weight or persistent instability requires prompt assessment to prevent complications.

Tips for Medical Coders

Document the specific type of open fracture (IIIA, IIIB, or IIIC) and confirm the nondisplaced nature of the Maisonneuve's fracture. Include details about the initial encounter and any associated injuries (e.g., medial malleolus or deltoid ligament damage) to support code assignment. Ensure the left leg and open fracture classification are clearly documented to align with the code S82.865C.