S82.156N Nondisplaced fracture of unspecified tibial tuberosity, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Name of the Condition

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

Summary

A nondisplaced fracture of the tibial tuberosity involves a break in the bony prominence on the anterior tibia where the patellar tendon attaches, with the bone fragments remaining in their normal alignment. This injury is classified as a subsequent encounter for an open fracture type IIIA, IIIB, or IIIC, indicating the fracture site was previously exposed and treated, and nonunion is present (failure of the bone to heal). The tibial tuberosity is critical for knee extension, and nonunion may result in persistent pain or functional limitations despite prior interventions.

Causes

Traumatic injury is the primary cause, such as direct impact to the knee, falls, or sudden forceful contraction of the quadriceps muscle. Open fractures (types IIIA, IIIB, or IIIC) typically result from high-energy trauma, where the force of the injury breaks the skin and exposes the fracture site. Nonunion may develop due to inadequate stabilization, poor blood supply, infection, or excessive motion at the fracture site during healing.

Risk Factors

• Participation in high-impact sports (e.g., basketball, soccer)
• Adolescent growth spurts with rapid bone growth
• Previous knee injuries or surgeries
• Osteoporosis or bone-weakening conditions
• High-impact trauma exposure (e.g., motor vehicle accidents)
• Inadequate initial fracture management or noncompliance with treatment

Symptoms

• Persistent localized pain and swelling over the tibial tuberosity
• Difficulty extending the knee or bearing weight
• Bruising or tenderness on palpation
• Visible or palpable gap at the fracture site (if nonunion is severe)
• Possible signs of infection (e.g., redness, drainage) in open fracture cases

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and functional limitations, along with imaging studies. X-rays or CT scans confirm the fracture and evaluate for nonunion (e.g., persistent fracture line, lack of callus formation). For open fractures, documentation of wound status (type IIIA, IIIB, or IIIC) and prior treatment history is critical. Additional tests (e.g., blood work) may assess for infection or healing potential.

Treatment Options

Treatment focuses on promoting bone healing and addressing nonunion. Options may include surgical intervention (e.g., internal fixation, bone grafting) to stabilize the fracture and encourage union. Non-surgical approaches (e.g., bracing, restricted weight-bearing) may be used for select cases. Management of open fractures involves wound care and infection prevention. Physical therapy is often recommended to restore function once healing progresses.

Prognosis and Follow-Up

Prognosis depends on the severity of nonunion and response to treatment. Surgical intervention generally improves healing rates, but recovery may take several months. Follow-up imaging (e.g., X-rays) monitors progress. Persistent nonunion may require additional procedures. Long-term outcomes include potential residual pain or functional limitations, particularly if the patellar tendon attachment is affected.

Complications

• Persistent nonunion or delayed healing
• Infection (especially in open fracture cases)
• Chronic pain or instability
• Limited knee range of motion
• Need for additional surgeries
• Potential for arthritis in the knee joint over time

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider
• Use proper protective gear during sports
• Maintain bone health through adequate nutrition (e.g., calcium, vitamin D)
• Follow post-treatment weight-bearing restrictions
• Engage in gradual, supervised physical therapy to restore strength and mobility

When to Seek Professional Help

Seek care if experiencing worsening pain, swelling, or difficulty bearing weight; signs of infection (e.g., fever, drainage); or if the knee feels unstable. Prompt evaluation is necessary for persistent symptoms or if nonunion is suspected.

Tips for Medical Coders

Document the fracture type (IIIA, IIIB, or IIIC) and confirmation of nonunion to support the code. Include details of prior treatment, wound status, and imaging findings. Ensure the encounter is classified as "subsequent" (not initial) and specify the open fracture type. Note any contributing factors (e.g., infection, inadequate prior care) that may impact coding and reimbursement.