S82.153P Displaced fracture of unspecified tibial tuberosity, subsequent encounter for closed fracture with malunion

Name of the Condition

• Displaced fracture of unspecified tibial tuberosity, subsequent encounter for closed fracture with malunion

Summary

A displaced fracture of the tibial tuberosity involves a break in the bony prominence on the anterior tibia where the patellar tendon attaches. Displacement means the bone fragments are misaligned. This code specifies a subsequent encounter for a closed fracture with malunion, indicating the fracture has healed in an abnormal position without surgical intervention to correct alignment. The condition may affect knee function due to altered biomechanics.

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. Malunion occurs when the bone heals in a non-anatomic position, often due to inadequate immobilization or displacement during initial healing.

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
• Inadequate initial fracture management or immobilization

Symptoms

• Persistent pain and swelling over the tibial tuberosity
• Limited knee range of motion or difficulty bearing weight
• Visible deformity or abnormal positioning of the knee
• Bruising or discoloration in the affected area
• Altered gait or knee instability

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and deformity. Imaging studies, such as X-rays, are used to confirm the fracture and evaluate malunion. CT scans may be ordered to assess the extent of displacement and healing. Clinical correlation with the patient’s history of prior fracture and treatment is essential.

Treatment Options

Treatment focuses on managing symptoms and improving function. Options may include physical therapy to strengthen surrounding muscles, bracing or orthotics to support the knee, and pain management. Surgical intervention is considered if malunion significantly impairs function or causes chronic pain.

Prognosis and Follow-Up

Prognosis depends on the degree of malunion and functional impact. Most patients experience improved symptoms with conservative management, though some may have persistent limitations. Regular follow-up with imaging and functional assessments helps monitor healing and adjust treatment plans as needed.

Complications

• Chronic pain or discomfort
• Reduced knee mobility or instability
• Increased risk of future knee injuries
• Arthritis or degenerative changes over time
• Need for surgical correction in severe cases

Lifestyle & Prevention

• Avoid high-impact activities that stress the knee until cleared by a provider
• Use proper protective gear during sports
• Maintain bone health through adequate nutrition and exercise
• Follow post-fracture rehabilitation guidelines to optimize healing

When to Seek Professional Help

Seek care if symptoms worsen, new swelling or deformity occurs, or there is increased pain or difficulty bearing weight. Prompt evaluation is important if knee function declines or if signs of infection (e.g., redness, fever) develop.

Tips for Medical Coders

This code is for a subsequent encounter of a closed fracture with malunion. Document the fracture’s healing status, presence of malunion, and whether the encounter is for evaluation or management of the malunion. Ensure clinical notes support the closed nature of the fracture and the malunion diagnosis.