S82.013N Displaced osteochondral fracture of unspecified patella, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Name of the Condition

• Displaced osteochondral fracture of unspecified patella, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Summary

This condition involves a displaced fracture of the patella (kneecap) where a portion of the bone and its attached cartilage is separated from the main structure. The fracture is open (exposing the bone to the external environment) and classified as type IIIA, IIIB, or IIIC, indicating severe soft tissue damage. The term "subsequent encounter" specifies this is a follow-up visit for the injury, and "nonunion" indicates the fracture has failed to heal properly after an expected period.

Causes

Direct trauma to the knee, such as a high-impact injury or forceful blow, can cause the fracture. The open nature of the fracture results from the trauma breaching the skin, and nonunion may occur due to inadequate initial treatment, poor blood supply, or excessive movement at the fracture site.

Risk Factors

• Participation in activities with a high risk of knee injury, such as contact sports or falls.
• Osteoporosis or other bone-weakening conditions.
• Previous knee injuries or surgeries that may impair healing.
• Advanced age, which can reduce bone density and healing capacity.
• Smoking or poor nutrition, which may affect bone repair.

Symptoms

• Persistent pain in the knee, often worsening with movement.
• Swelling, bruising, or drainage from the open wound site.
• Inability to bear weight or fully straighten the knee.
• Visible deformity or instability in the kneecap area.
• Signs of infection, such as redness, warmth, or fever.

Diagnosis

A physical examination assesses knee stability, swelling, and wound healing. Imaging studies, including X-rays or CT scans, confirm the fracture type and nonunion. Laboratory tests may check for infection or assess bone healing. The open wound is evaluated for severity and contamination.

Treatment Options

• Surgical intervention to realign the fracture, remove damaged tissue, or stabilize the patella with hardware.
• Antibiotics to treat or prevent infection in open fractures.
• Immobilization with a brace or cast to protect the knee during healing.
• Physical therapy to restore strength and mobility once healing progresses.
• Bone grafting or other procedures to promote union in cases of nonunion.

Prognosis and Follow-Up

Prognosis depends on the severity of the fracture, infection risk, and response to treatment. Nonunion may require additional surgeries. Follow-up visits monitor healing, wound status, and functional recovery. Long-term outcomes can include persistent pain or reduced knee function, especially with complications.

Complications

• Infection of the open wound or bone (osteomyelitis).
• Chronic pain or arthritis in the knee.
• Limited range of motion or instability.
• Delayed or failed healing (nonunion) requiring further intervention.
• Nerve or blood vessel damage from the initial trauma or surgery.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports or activities with fall risks.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Follow post-surgical instructions carefully to aid healing.
• Attend all follow-up appointments to monitor progress.

When to Seek Professional Help

Seek immediate care for severe pain, swelling, fever, or signs of infection (e.g., redness, drainage). Contact a provider if pain worsens, mobility decreases, or the wound shows no improvement. Urgent evaluation is needed for new deformity or inability to bear weight.

Tips for Medical Coders

Document the encounter as a subsequent visit for an open fracture (type IIIA, IIIB, or IIIC) with nonunion. Include details on wound status, infection, and treatment provided. Ensure the patella side is unspecified and note any surgical interventions or complications. Code S82.013N requires confirmation of nonunion and the open fracture type to accurately reflect the condition.