S82.843 Displaced bimalleolar fracture of unspecified lower leg

Name of the Condition

• Displaced bimalleolar fracture of unspecified lower leg
• ICD-10 Code: S82.843

Summary

A displaced bimalleolar fracture of the unspecified lower leg involves a break in both the medial (inner) and lateral (outer) malleoli, the bony prominences at the distal end of the tibia and fibula. The fracture is displaced, meaning bone fragments are shifted out of their normal alignment. This injury typically affects the ankle joint and may result in instability due to the involvement of both bones. It often occurs from trauma that disrupts the structural integrity of the ankle.

Causes

Displaced bimalleolar fractures commonly result from high-impact trauma, such as falls, motor vehicle accidents, or sports-related injuries. Direct force to the ankle, particularly when the foot is in a fixed position, can cause both malleoli to fracture and shift out of alignment. Twisting or rotational forces may also contribute to this type of injury.

Risk Factors

• Participation in activities with a high risk of ankle trauma, such as contact sports or skiing.
• Advanced age, which may lead to decreased bone density and increased fracture susceptibility.
• Conditions that weaken bone structure, such as osteoporosis or metabolic disorders.
• Previous ankle injuries or surgeries that compromise joint stability.

Symptoms

• Severe pain, swelling, and bruising around the ankle.
• Inability to bear weight on the affected leg.
• Visible deformity or misalignment of the ankle joint.
• Tenderness and instability when attempting movement.

Diagnosis

Diagnosis begins with a physical examination to assess pain, swelling, and deformity. Imaging, such as X-rays, confirms the fracture and displacement. CT or MRI may be used for detailed visualization of complex injuries or associated soft tissue damage.

Treatment Options

Treatment depends on the severity of displacement and patient factors. Non-surgical options include immobilization with a cast or brace and pain management. Surgical intervention may be necessary to realign and stabilize the bones using plates, screws, or pins. Physical therapy is often recommended during recovery to restore function and strength.

Prognosis and Follow-Up

Prognosis varies based on injury severity, treatment, and patient health. Most patients recover with proper care, though full function may take months. Follow-up appointments monitor healing, alignment, and rehabilitation progress. Complications like arthritis or chronic instability may require long-term management.

Complications

• Post-traumatic arthritis due to joint damage.
• Chronic ankle instability or reduced mobility.
• Nerve or blood vessel injury in severe cases.
• Infection or delayed healing after surgery.

Lifestyle & Prevention

• Wear supportive footwear and avoid uneven surfaces.
• Engage in bone-strengthening exercises to improve density.
• Use protective gear during high-risk activities like sports.
• Maintain a healthy weight to reduce fracture risk.

When to Seek Professional Help

Seek immediate care for severe pain, visible deformity, inability to bear weight, or signs of infection (e.g., fever, redness). Prompt evaluation is critical to prevent complications and ensure proper treatment.

Tips for Medical Coders

Document the displacement and involvement of both malleoli clearly. Specify laterality if known, but use "unspecified" when not documented. Include details on trauma mechanism or associated injuries to support code assignment. Ensure alignment with clinical findings and imaging reports.