S82.863 Displaced Maisonneuve's fracture of unspecified leg

Name of the Condition

• Displaced Maisonneuve's fracture of unspecified leg
• ICD-10 Code: S82.863

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 fracture of the medial malleolus or deltoid ligament injury. The term "displaced" indicates that the fractured bone fragments are not aligned properly. This injury typically results from rotational forces applied to the ankle, commonly seen in trauma such as falls or sports injuries.

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.

Risk Factors

• Participation in high-impact sports or activities with sudden directional changes.
• Previous ankle injuries or ligamentous instability.
• Traumatic events involving rotational forces to the ankle.
• Age-related factors that may affect bone density or ligament integrity.

Symptoms

• Severe pain and swelling around the ankle and proximal fibula.
• 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 ligament tears.

Treatment Options

Treatment depends on the severity of the fracture and associated injuries. Non-displaced fractures may be managed with immobilization (e.g., casting or bracing) and physical therapy. Displaced fractures often require surgical intervention to realign the bone and stabilize the syndesmosis, followed by rehabilitation to restore function.

Prognosis and Follow-Up

Prognosis is generally favorable with appropriate treatment, though recovery may take several months. Follow-up care includes monitoring for healing, assessing ankle stability, and guiding rehabilitation to prevent long-term complications like chronic instability or arthritis.

Complications

• Chronic ankle instability or recurrent sprains.
• Post-traumatic arthritis due to joint damage.
• Nerve or vascular injury in severe cases.
• Nonunion or malunion of the fibula fracture if untreated.

Lifestyle & Prevention

• Wear supportive footwear and use ankle braces during high-risk activities.
• Improve ankle strength and flexibility through targeted exercises.
• Avoid uneven surfaces or activities with high rotational stress on the ankle.
• Address previous ankle injuries promptly to reduce instability risk.

When to Seek Professional Help

Seek immediate medical attention if you experience severe ankle pain, inability to bear weight, visible deformity, or signs of nerve/vascular compromise (e.g., numbness, discoloration). Persistent pain, swelling, or instability after an injury also warrants evaluation.

Tips for Medical Coders

Document the specific leg (right/left/unspecified) and displacement status to ensure accurate coding. For S82.863, confirm the fracture is displaced and the leg is not specified. Include details on associated injuries (e.g., medial malleolus, syndesmotic ligament tears) to support comprehensive coding.