S82.011P Displaced osteochondral fracture of right patella, subsequent encounter for closed fracture with malunion

Name of the Condition

• Displaced osteochondral fracture of right patella, subsequent encounter for closed fracture with malunion

Summary

This condition involves a displaced fracture of the right patella (kneecap) that includes damage to the adjacent cartilage (osteochondral injury). The fracture is closed, meaning the skin is intact, and it is a subsequent encounter for this specific injury. Malunion indicates that the bone fragments have healed in a non-anatomical position, which may affect joint function. Displacement and cartilage involvement distinguish this from other patellar fractures.

Causes

Direct trauma to the knee, such as a fall onto the kneecap, a forceful blow, or a high-impact injury (e.g., motor vehicle accident or sports injury). The malunion occurs when the fracture heals with improper alignment, often due to inadequate initial treatment or insufficient immobilization. The osteochondral component suggests cartilage involvement, which may occur with significant force or rotational stress.

Risk Factors

• Participation in activities with a high risk of knee injury, such as contact sports or skiing.
• Osteoporosis or other bone-weakening conditions.
• Previous knee injuries or surgeries.
• Advanced age, which may reduce bone density.
• Inadequate initial fracture management or immobilization.

Symptoms

• Chronic pain in the right knee, especially with movement or weight-bearing.
• Swelling and stiffness around the kneecap.
• Difficulty straightening or bending the knee fully.
• Visible deformity or a gap in the kneecap area.
• A "popping" or grinding sensation during knee movement.

Diagnosis

A physical examination to assess knee movement, swelling, and tenderness. Imaging studies, typically X-rays, to confirm the malunion and evaluate bone alignment. CT or MRI may be used to assess cartilage damage and joint function. Comparison with prior imaging may help determine the extent of malunion.

Treatment Options

• Conservative management: Physical therapy to improve strength and range of motion, pain management, and activity modification.
• Surgical intervention: Osteotomy or realignment procedures to correct malunion, or cartilage repair techniques if needed.
• Bracing or orthotics to support the knee during healing.

Prognosis and Follow-Up

Prognosis depends on the severity of malunion and cartilage damage. Most patients experience improved function with treatment, but some may have persistent pain or limited mobility. Regular follow-up with imaging and physical therapy is recommended to monitor healing and adjust treatment as needed.

Complications

• Chronic pain or arthritis in the knee joint.
• Reduced range of motion or stiffness.
• Increased risk of future knee injuries.
• Need for additional surgery if malunion worsens.

Lifestyle & Prevention

• Avoid high-impact activities that stress the knee.
• Maintain a healthy weight to reduce joint load.
• Use proper protective gear during sports or activities with knee injury risk.
• Follow post-injury rehabilitation guidelines to optimize healing.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden, severe knee pain, inability to bear weight, or visible deformity. Contact your healthcare provider if chronic pain, swelling, or stiffness persists despite treatment.

Tips for Medical Coders

Document the subsequent encounter, closed fracture status, and malunion clearly in the medical record. Ensure the right patella and osteochondral involvement are specified. Use this code for encounters after the initial fracture treatment when malunion is present and the fracture remains closed.