S82.864B Nondisplaced Maisonneuve's fracture of right leg, initial encounter for open fracture type I or II

Name of the Condition

• Nondisplaced Maisonneuve's fracture of right leg, initial encounter for open fracture type I or II
• ICD-10 Code: S82.864B

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, where the wound is typically less than 1 cm (type I) or 1–10 cm (type II) in length, and the fracture site is not exposed or is minimally exposed.

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. The open nature of the fracture suggests the injury involved a forceful impact that broke the skin, such as a direct blow or a severe twist.

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 significant rotational forces to the ankle.

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 laceration at the fracture site (consistent with open fracture type I or II).

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 performed to evaluate soft tissue damage or confirm the nondisplaced nature of the fracture. The open wound is assessed for size, contamination, and exposure of the fracture site to classify the fracture type.

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 non-weight-bearing status. Open fractures require wound care, including irrigation and debridement, to reduce infection risk. Surgical intervention may be necessary if the syndesmosis is unstable or if the fracture requires reduction. Antibiotics are often administered for open fractures to prevent infection.

Prognosis and Follow-Up

Prognosis depends on the severity of the injury and adherence to treatment. Nondisplaced fractures generally heal well with proper immobilization and wound care. Follow-up appointments are necessary to monitor healing, assess for complications (e.g., infection or malunion), and guide rehabilitation. Physical therapy may be recommended to restore strength and mobility once the fracture has healed.

Complications

• Infection, particularly with open fractures.
• Delayed healing or nonunion of the fracture.
• Malalignment or instability of the ankle joint.
• Chronic pain or arthritis in the ankle.
• Nerve or vascular damage from the initial injury or surgical intervention.

Lifestyle & Prevention

• Wear appropriate footwear for activities, especially those with high rotational stress.
• Maintain ankle strength and flexibility through exercise.
• Avoid uneven terrain or hazardous conditions that increase fall risk.
• Use protective gear during sports or high-risk activities.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, inability to bear weight, visible deformity, or an open wound after an ankle injury. Prompt evaluation is critical to prevent complications and ensure proper treatment.

Tips for Medical Coders

Document the nondisplaced nature of the fracture, the open wound characteristics (size and contamination), and the initial encounter status. Specify the right leg and the open fracture type (I or II) to accurately reflect the injury. Ensure documentation supports the syndesmotic ligament tear and any associated medial malleolus or deltoid ligament injury, as these are key components of a Maisonneuve's fracture.