S82.032P Displaced transverse fracture of left patella, subsequent encounter for closed fracture with malunion

Name of the Condition

• Displaced transverse fracture of left patella, subsequent encounter for closed fracture with malunion

Summary

This condition involves a horizontal break across the left kneecap (patella), a triangular bone protecting the knee joint. The fracture line runs perpendicular to the bone’s long axis, and the bone fragments are displaced from their normal alignment. The fracture is closed (skin intact), and this is a subsequent encounter for treatment. Malunion indicates the fracture has healed in a non-anatomic position, which may affect knee function and stability.

Causes

Direct trauma to the knee, such as a fall onto the kneecap, a blow from an object, or a forceful contraction of the quadriceps muscle. High-impact injuries, like those from sports or motor vehicle accidents, are common triggers. Malunion occurs when the fracture heals improperly, often due to inadequate initial alignment or insufficient immobilization.

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

• Persistent pain in the left knee, especially with movement.
• Swelling and bruising around the kneecap.
• Difficulty straightening the knee or bearing weight.
• Visible deformity or a gap in the kneecap area.
• Reduced range of motion or instability in the knee joint.

Diagnosis

A physical examination to assess knee movement, swelling, and tenderness. Imaging studies, typically X-rays, to confirm the fracture and evaluate bone alignment. CT scans may be used to assess malunion severity. Clinical history, including prior fracture treatment, helps determine the encounter type.

Treatment Options

• Physical therapy to improve strength and range of motion.
• Pain management with medications or injections.
• Bracing or orthotics to support the knee.
• Surgical intervention (e.g., osteotomy or realignment) if malunion causes significant functional impairment.
• Activity modification to avoid aggravating the injury.

Prognosis and Follow-Up

Prognosis depends on the degree of malunion and functional impact. Most patients experience improved symptoms with treatment, but residual stiffness or pain may persist. Follow-up imaging and clinical assessments monitor healing and guide rehabilitation. Long-term outcomes vary based on fracture severity and treatment response.

Complications

• Chronic pain or stiffness in the knee.
• Reduced knee function or instability.
• Increased risk of future knee injuries.
• Arthritis in the knee joint over time.
• Need for additional surgery if malunion worsens.

Lifestyle & Prevention

• Engage in low-impact exercises to maintain knee strength.
• Use protective gear during high-risk activities.
• Maintain a healthy weight to reduce knee stress.
• Follow post-injury rehabilitation plans to optimize healing.
• Avoid activities that strain the knee until cleared by a healthcare provider.

When to Seek Professional Help

• Worsening pain, swelling, or bruising.
• Inability to bear weight or move the knee.
• New deformity or instability in the knee.
• Signs of infection (e.g., redness, warmth, fever).
• Persistent symptoms despite treatment.

Tips for Medical Coders

Document the subsequent encounter, closed fracture status, and malunion clearly. Include details on treatment provided, functional impact, and any imaging findings. Ensure the encounter type (subsequent) and malunion are explicitly noted to support accurate coding.