S82.036P Nondisplaced transverse fracture of unspecified patella, subsequent encounter for closed fracture with malunion

Name of the Condition

• Nondisplaced transverse fracture of unspecified patella, subsequent encounter for closed fracture with malunion

Summary

This condition involves a horizontal break across the kneecap (patella) where the bone fragments remain aligned (nondisplaced) and the fracture is closed (skin intact). The fracture line runs perpendicular to the bone’s long axis. This is a subsequent encounter, indicating follow-up care for a fracture that has healed with malunion—meaning the bone fragments have united in a non-anatomical position, potentially affecting function or alignment.

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 may occur if the initial fracture was not properly aligned or immobilized during healing.

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 immobilization or premature weight-bearing during initial fracture healing.

Symptoms

• Persistent pain in the knee, especially with movement or weight-bearing.
• Swelling or bruising around the kneecap that may not fully resolve.
• Reduced range of motion or difficulty straightening the knee.
• A noticeable deformity or abnormal contour of the kneecap.
• Instability or a feeling of the knee "giving way."

Diagnosis

A physical examination to assess knee movement, swelling, and tenderness. Imaging studies, typically X-rays, to confirm the fracture has healed with malunion and evaluate bone alignment. Comparison with prior imaging may be used to assess healing progression. In some cases, a CT scan may be used to assess the extent of malunion.

Treatment Options

• Pain management with medications or physical therapy to improve mobility and strength.
• Bracing or orthotics to support the knee and reduce strain.
• Surgical intervention, such as osteotomy or hardware removal, if malunion causes significant functional impairment or pain.
• Rehabilitation to restore range of motion and muscle function.

Prognosis and Follow-Up

Prognosis depends on the severity of malunion and functional impact. Most patients experience improved symptoms with treatment, but residual stiffness or pain may persist. Follow-up care focuses on monitoring healing, assessing functional recovery, and adjusting treatment plans as needed. Long-term follow-up may be required if malunion affects knee mechanics.

Complications

• Chronic pain or discomfort.
• Reduced knee function or mobility.
• Increased risk of future knee injuries due to altered mechanics.
• Arthritis or joint degeneration over time.
• Need for additional surgery if malunion worsens.

Lifestyle & Prevention

• Avoid high-impact activities that stress the knee until cleared by a healthcare provider.
• Use proper protective gear during sports or activities with fall risks.
• Maintain bone health through adequate calcium and vitamin D intake.
• Follow post-injury rehabilitation guidelines to optimize healing and reduce malunion risk.

When to Seek Professional Help

Seek care if you experience worsening pain, increased swelling, new deformity, or inability to bear weight. Prompt evaluation is important if you notice signs of infection (e.g., redness, warmth, fever) or if symptoms do not improve with conservative management.

Tips for Medical Coders

This code is used for a subsequent encounter of a closed, nondisplaced transverse patellar fracture with malunion. Document the encounter type (subsequent), fracture status (closed, nondisplaced), and presence of malunion. Ensure clinical documentation supports the malunion diagnosis and subsequent care context.