S82.155N Nondisplaced fracture of left tibial tuberosity, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Name of the Condition

• Nondisplaced fracture of left tibial tuberosity, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Summary

A nondisplaced fracture of the left tibial tuberosity involves a break in the bony prominence on the anterior upper tibia where the patellar tendon attaches, with the bone fragments remaining aligned. This code applies to a subsequent encounter for an open fracture (types IIIA, IIIB, or IIIC) that has developed nonunion, meaning the fracture has failed to heal properly. Open fractures involve skin penetration, and nonunion indicates a lack of bony union after an expected healing period. This condition requires careful management to address both the fracture and potential complications from the open wound.

Causes

Traumatic injury is the primary cause, such as direct impact to the knee, falls, or sudden forceful contraction of the quadriceps muscle. The open nature of the fracture (types IIIA, IIIB, or IIIC) suggests significant soft tissue damage, often from high-energy trauma. Nonunion may result from inadequate initial treatment, poor blood supply, infection, or excessive movement at the fracture site.

Risk Factors

• High-energy trauma (e.g., motor vehicle accidents, sports injuries)
• Open fracture types IIIA, IIIB, or IIIC (indicating severe soft tissue damage)
• Poor blood supply to the tibial tuberosity
• Infection at the fracture site
• Inadequate immobilization or premature weight-bearing
• Underlying conditions affecting bone healing (e.g., diabetes, smoking)

Symptoms

• Persistent localized pain and swelling over the tibial tuberosity
• Difficulty extending the knee or bearing weight
• Visible or palpable gap at the fracture site (due to nonunion)
• Signs of infection (e.g., redness, drainage, fever) if present
• Limited range of motion in the knee

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and functional limitations. Imaging studies, such as X-rays, are used to confirm the fracture and evaluate alignment, as well as to identify nonunion (e.g., persistent fracture line, lack of callus formation). CT or MRI may be ordered to assess soft tissue damage and bone healing. Laboratory tests (e.g., white blood cell count) may be performed if infection is suspected.

Treatment Options

Treatment focuses on promoting fracture healing and managing the open wound. Options may include surgical intervention (e.g., internal fixation, bone grafting) to stabilize the fracture and address nonunion. Antibiotics are used if infection is present. Wound care and possible debridement are necessary for open fractures. Physical therapy is often recommended to restore knee function once healing progresses.

Prognosis and Follow-Up

Prognosis depends on the severity of the open fracture and the success of treatment for nonunion. Healing may be prolonged, and some patients may experience residual knee stiffness or weakness. Regular follow-up with imaging is typically required to monitor progress. Complications such as infection or chronic pain may affect recovery.

Complications

• Infection (due to open fracture)
• Chronic pain or instability
• Nonunion or malunion
• Knee stiffness or limited range of motion
• Nerve or vascular damage (rare)

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Follow weight-bearing restrictions and immobilization guidelines.
• Maintain good nutrition to support bone healing.
• Practice proper wound care if the fracture is open.
• Use protective equipment during sports to reduce trauma risk.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Increased pain, swelling, or redness at the fracture site.
• Fever or signs of infection (e.g., drainage, warmth).
• Sudden inability to bear weight or move the knee.
• New or worsening deformity.

Tips for Medical Coders

Document the encounter as a subsequent visit for an open fracture (types IIIA, IIIB, or IIIC) with nonunion. Include details on the fracture's alignment (nondisplaced), the open fracture type, and evidence of nonunion (e.g., imaging findings, clinical assessment). Ensure documentation supports the "subsequent encounter" status and the specific open fracture classification.