S82.026M Nondisplaced longitudinal fracture of unspecified patella, subsequent encounter for open fracture type I or II with nonunion

Name of the Condition

• Nondisplaced longitudinal fracture of unspecified patella, subsequent encounter for open fracture type I or II with nonunion

Summary

A nondisplaced longitudinal fracture of the patella is a vertical break in the kneecap that does not shift out of alignment. This fracture is classified as open (type I or II), meaning the skin is broken but contamination is minimal. The term "nonunion" indicates the fracture has failed to heal properly, and this encounter is subsequent, meaning it occurs after the initial treatment phase. The condition may limit knee function and requires ongoing management to address healing and potential complications.

Causes

Direct trauma to the knee, such as a fall onto the kneecap, a forceful blow, or a sudden contraction of the quadriceps muscle. High-impact events, like sports injuries or motor vehicle accidents, are common triggers. The open nature of the fracture suggests the force was sufficient to break the skin while causing the bone injury. Nonunion may result from inadequate immobilization, poor blood supply, or infection.

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.
• Smoking or poor nutrition, which can impair bone healing.

Symptoms

• Persistent pain in the knee, especially with movement.
• Swelling and bruising around the kneecap.
• Inability to fully straighten the knee or bear weight.
• Visible deformity or a gap in the kneecap area.
• An open wound (if present) that may show signs of infection.
• A "popping" sensation at the time of injury (if recent).

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 or MRI may be used to assess nonunion or soft tissue damage. Laboratory tests to check for infection if the wound is open. Review of prior treatment and imaging to determine the fracture's healing status.

Treatment Options

• Immobilization with a cast or brace to stabilize the knee.
• Surgical intervention, such as internal fixation, to promote healing.
• Antibiotics if infection is present.
• Physical therapy to restore strength and mobility.
• Pain management with medications or other modalities.
• Monitoring for signs of healing or complications.

Prognosis and Follow-Up

Prognosis depends on the fracture's ability to heal and the success of treatment. Nonunion may require additional interventions, such as surgery or bone grafting. Follow-up appointments are necessary to monitor healing, adjust treatment, and address complications. Long-term outcomes may include reduced knee function or arthritis if the fracture does not heal properly.

Complications

• Nonunion or delayed healing.
• Infection, especially with open fractures.
• Arthritis in the knee joint.
• Chronic pain or stiffness.
• Nerve or blood vessel damage.
• Need for additional surgery.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports or activities with knee injury risk.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Quit smoking, as it impairs bone healing.
• Follow post-treatment instructions carefully to promote proper healing.

When to Seek Professional Help

• Severe or worsening pain.
• Increased swelling, redness, or drainage from the wound.
• Fever or signs of infection.
• Inability to bear weight or move the knee.
• New or worsening deformity.
• Persistent symptoms after treatment.

Tips for Medical Coders

Document the fracture type (open I or II), the presence of nonunion, and the encounter type (subsequent) clearly. Include details about the fracture's alignment, any surgical interventions, and the status of healing. Ensure the open fracture classification is supported by clinical documentation, and note any complications or additional treatments provided.