S82.036N Nondisplaced transverse fracture of unspecified patella, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Name of the Condition

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

Summary

This condition involves a horizontal break across the kneecap (patella) where the bone fragments remain aligned (nondisplaced) but the fracture is open (exposing the bone to the external environment) and has failed to heal (nonunion). The fracture line runs perpendicular to the bone’s long axis, and the open nature indicates the skin is breached, with severity classified as type IIIA, IIIB, or IIIC (involving extensive soft tissue damage, contamination, or vascular injury). This is a subsequent encounter, meaning it follows an initial treatment phase, and the nonunion indicates the fracture has not healed within the expected timeframe.

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. The open fracture occurs when the trauma also breaks the skin, allowing exposure of the fractured bone, and nonunion may result from inadequate initial treatment, infection, 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 skiing.
• Osteoporosis or other bone-weakening conditions.
• Previous knee injuries or surgeries.
• Advanced age, which may reduce bone density.
• Situations where the knee is exposed to direct impact or forceful flexion.
• Poor initial fracture management or delayed treatment.

Symptoms

• Persistent pain in the knee that does not improve with time.
• Swelling and bruising around the kneecap that may worsen.
• Inability to straighten the knee or bear weight.
• Visible deformity or a gap in the kneecap area.
• Drainage or signs of infection at the open wound site.
• A "popping" sensation at the time of injury, followed by chronic discomfort.

Diagnosis

A physical examination to assess knee movement, swelling, and tenderness, with attention to the open wound and signs of infection. Imaging studies, typically X-rays, to confirm the fracture, evaluate bone alignment, and assess for nonunion (e.g., visible gap or sclerosis at the fracture site). In some cases, a CT scan may be used to evaluate the fracture in detail, and laboratory tests (e.g., blood work) may be performed to check for infection or inflammation.

Treatment Options

Treatment focuses on addressing the nonunion and open fracture. This may include surgical intervention to realign and stabilize the fracture (e.g., internal fixation with screws or plates), debridement of the wound to remove infected or dead tissue, and possible bone grafting to promote healing. Antibiotics are often prescribed to treat or prevent infection, and physical therapy is used to restore knee function and strength. The approach depends on the severity of the open fracture and the extent of nonunion.

Prognosis and Follow-Up

Prognosis depends on the severity of the open fracture, the success of treatment, and the patient’s overall health. Nonunion fractures may require additional interventions, and recovery can be prolonged. Follow-up care involves regular monitoring of the fracture site (via imaging) and wound healing, as well as ongoing physical therapy to improve mobility. Patients may need to avoid weight-bearing activities until the fracture shows signs of healing.

Complications

• Infection at the open wound site, which can delay healing.
• Chronic pain or stiffness in the knee.
• Nonunion or malunion (improper healing) of the fracture.
• Arthritis in the knee joint over time.
• Nerve or blood vessel damage from the initial trauma or surgery.
• Limited range of motion or difficulty bearing weight.

Lifestyle & Prevention

• Avoid high-impact activities that risk knee injury until cleared by a healthcare provider.
• Use protective gear (e.g., knee pads) during sports or work that involves knee stress.
• Maintain bone health through a balanced diet rich in calcium and vitamin D.
• Follow post-treatment instructions carefully to support healing.
• Attend all follow-up appointments to monitor progress and address complications early.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Sudden, severe knee pain or swelling.
• Inability to move the knee or bear weight.
• Visible deformity or open wound at the kneecap.
• Signs of infection (e.g., redness, warmth, drainage, fever).
• Worsening pain or symptoms that do not improve with rest or treatment.

Tips for Medical Coders

Document the encounter as a subsequent visit for an open fracture (type IIIA, IIIB, or IIIC) with nonunion. Ensure the record specifies the fracture type (open) and the presence of nonunion, as these details are critical for accurate coding. Note the timing of the encounter (subsequent) and any treatments performed, such as surgery or debridement, to support the code assignment.