S82.864H Nondisplaced Maisonneuve's fracture of right leg, subsequent encounter for open fracture type I or II with delayed healing

Name of the Condition

• Nondisplaced Maisonneuve's fracture of right leg, subsequent encounter for open fracture type I or II with delayed healing

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 in their normal alignment. This injury typically results from rotational forces applied to the ankle, commonly seen in trauma such as falls or sports injuries. The "subsequent encounter" designation indicates this is a follow-up visit for an established fracture, while "open fracture type I or II" refers to a break in the skin with minimal contamination (wound length <1 cm for type I, 1–10 cm for type II). "Delayed healing" signifies that the fracture has not progressed as expected during the normal healing timeline.

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 the injury involved a forceful impact that broke the skin, such as a direct blow or a severe twist. Delayed healing may result from factors like poor blood supply, infection, or inadequate immobilization.

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.
• Open fracture type, which increases infection risk and may impede healing.
• Conditions like diabetes or smoking that impair bone healing.

Symptoms

• Persistent pain and swelling localized to the proximal fibula and ankle, despite treatment.
• Difficulty bearing weight on the affected leg.
• Instability or a feeling of the ankle "giving way."
• Visible or palpable wound at the fracture site (for open fractures).
• Delayed or absent signs of healing (e.g., lack of callus formation on imaging).

Diagnosis

Diagnosis involves a combination of clinical evaluation and imaging. The provider will assess the patient's history of trauma, examine the ankle for swelling, tenderness, or instability, and review prior treatment. Imaging typically includes X-rays to confirm the fracture pattern and assess alignment, with possible CT or MRI to evaluate soft tissue damage or healing progress. The "subsequent encounter" status implies prior documentation of the fracture and treatment, while "delayed healing" is confirmed by imaging showing insufficient bone union over time.

Treatment Options

Treatment focuses on promoting healing and restoring function. For nondisplaced fractures, immobilization with a cast or brace may be sufficient, but open fractures require wound care to prevent infection. Surgical intervention may be needed to stabilize the fracture or repair ligaments if instability persists. Physical therapy is often recommended to restore strength and mobility once healing allows. Management of delayed healing may include additional immobilization, bone stimulation, or surgery to address underlying issues like infection or poor blood supply.

Prognosis and Follow-Up

Prognosis depends on the severity of the fracture, the presence of open wounds, and the response to treatment. Nondisplaced fractures generally heal well with proper care, but open fractures and delayed healing increase the risk of complications. Follow-up visits are essential to monitor healing progress, adjust treatment, and address any issues. Long-term outcomes may include residual ankle stiffness or instability, which can be managed with therapy or orthotics.

Complications

• Infection at the open fracture site.
• Nonunion or malunion of the fracture.
• Chronic ankle instability or arthritis.
• Nerve or blood vessel damage.
• Prolonged pain or functional impairment.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a provider.
• Use proper footwear and protective gear during sports.
• Maintain a healthy diet and avoid smoking to support bone healing.
• Follow rehabilitation guidelines to restore strength and mobility.
• Address underlying conditions (e.g., diabetes) that may affect healing.

When to Seek Professional Help

Seek care if you experience increasing pain, swelling, or drainage from the wound; inability to bear weight; or signs of infection (e.g., fever, redness). Prompt evaluation is necessary if healing does not progress as expected or if new symptoms develop.

Tips for Medical Coders

Document the fracture type (open I/II), subsequent encounter status, and evidence of delayed healing (e.g., imaging reports, clinical notes). Ensure the code aligns with the specific encounter type and healing status to reflect the current clinical scenario accurately.