S82.153M Displaced fracture of unspecified tibial tuberosity, subsequent encounter for open fracture type I or II with nonunion

Name of the Condition

• Displaced fracture of unspecified tibial tuberosity, subsequent encounter for open fracture type I or II with nonunion

Summary

A displaced fracture of the tibial tuberosity involves a break in the bony prominence on the anterior tibia where the patellar tendon attaches, with misalignment of bone fragments. This code specifies a subsequent encounter for an open fracture (type I or II) that has failed to heal (nonunion). Open fractures involve exposure of the bone through the skin, and nonunion indicates the fracture has not united after an expected healing period.

Causes

Traumatic injury is the primary cause, such as direct impact to the knee, falls, or sudden forceful contraction of the quadriceps muscle. Sports-related incidents, motor vehicle accidents, or other high-impact events can lead to this fracture. Open fractures may result from the initial trauma piercing the skin, while nonunion can occur due to inadequate stabilization, infection, or poor blood supply.

Risk Factors

• Participation in activities with rapid knee extension or jumping (e.g., basketball, soccer)
• Adolescent growth spurts, especially in athletes
• Previous knee injuries or surgeries
• Osteoporosis or bone-weakening conditions
• Delayed or inadequate initial treatment of the fracture

Symptoms

• Severe pain and swelling over the tibial tuberosity
• Inability to fully extend the knee or bear weight
• Visible deformity or abnormal positioning of the knee
• Open wound or exposed bone (in open fractures)
• Persistent pain or instability indicating nonunion

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, deformity, and wound status. Imaging studies, such as X-rays, are used to confirm the fracture, evaluate displacement, and assess for nonunion (e.g., visible fracture line, lack of callus formation). Additional tests like CT or MRI may be ordered to evaluate soft tissue damage or bone healing. The history of prior treatment and timeline of injury are critical for determining the encounter type and nonunion status.

Treatment Options

Treatment focuses on addressing the nonunion and open fracture. Options may include surgical intervention to realign and stabilize the fracture (e.g., internal fixation), debridement of the wound to prevent infection, and bone grafting to promote healing. Antibiotics are often used for open fractures to reduce infection risk. Physical therapy is typically initiated once the fracture shows signs of healing to restore function.

Prognosis and Follow-Up

Prognosis depends on the severity of the fracture, success of treatment, and patient factors (e.g., age, overall health). Nonunion fractures may require extended healing time or additional procedures. Regular follow-up with imaging is necessary to monitor progress. Most patients can regain knee function with appropriate treatment, though some may experience long-term stiffness or weakness.

Complications

• Infection (especially with open fractures)
• Persistent nonunion or malunion
• Chronic pain or instability
• Nerve or vascular damage
• Limited range of motion or arthritis

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider
• Use protective gear during sports or high-risk activities
• Maintain bone health through proper nutrition (e.g., calcium, vitamin D)
• Follow post-treatment rehabilitation plans to optimize healing

When to Seek Professional Help

Seek immediate medical attention for severe pain, inability to bear weight, visible deformity, or signs of infection (e.g., fever, increasing redness, drainage). Follow up with a healthcare provider if symptoms worsen or do not improve with treatment.

Tips for Medical Coders

This code is used for a subsequent encounter of a displaced tibial tuberosity fracture that is open (type I or II) with nonunion. Document the fracture type (open, type I or II), encounter stage (subsequent), and nonunion status clearly. Ensure the medical record supports the open fracture classification and nonunion diagnosis to justify the code assignment.