S82.865B Nondisplaced Maisonneuve's fracture of left leg, initial encounter for open fracture type I or II

Name of the Condition

• Nondisplaced Maisonneuve's fracture of left leg, initial encounter for open fracture type I or II
• ICD-10 Code: S82.865B

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 in their normal alignment. This injury typically results from rotational forces applied to the ankle, leading to instability in the ankle joint. The "open fracture type I or II" designation refers to a break in the skin with minimal contamination or a small wound, respectively, and "initial encounter" denotes 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. Open fractures occur when the broken bone pierces the skin, often due to high-energy trauma or direct impact.

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.
• Traumatic events involving rotational forces to the ankle.
• Age-related factors that may affect bone density or ligament integrity.

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.
• Visible wound or break in the skin (for open fractures).

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 syndesmotic ligament tears. The open fracture type is determined by the size and contamination of the wound.

Treatment Options

Treatment depends on the severity of the fracture and associated injuries. Nondisplaced fractures may be managed with immobilization (e.g., casting or bracing) and weight-bearing restrictions. Open fractures require prompt wound care, antibiotics, and often surgical intervention to clean the wound and stabilize the fracture. Syndesmotic injuries may need surgical repair to restore ankle stability.

Prognosis and Follow-Up

Prognosis is generally favorable with appropriate treatment, though recovery may take several months. Follow-up care includes monitoring for healing, physical therapy to restore function, and regular imaging to assess fracture union. Complications, such as infection or chronic instability, are more likely with open fractures and require ongoing evaluation.

Complications

• Infection (more common with open fractures).
• Chronic ankle instability.
• Delayed union or nonunion of the fracture.
• Post-traumatic arthritis.
• Nerve or vascular damage.

Lifestyle & Prevention

• Wear appropriate footwear for activities.
• Avoid uneven surfaces or hazardous environments.
• Strengthen ankle muscles through exercise.
• Use protective gear during high-risk sports.
• Address previous ankle injuries promptly to prevent instability.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, inability to bear weight, visible bone protrusion, or signs of infection (e.g., fever, increased redness, or pus). Delayed care for open fractures increases infection risk.

Tips for Medical Coders

Document the fracture location (left leg), displacement status (nondisplaced), encounter type (initial), and open fracture classification (type I or II) to ensure accurate coding. Include details on wound size, contamination, and associated injuries (e.g., syndesmotic tear) to support the code assignment.