S82.035N Nondisplaced transverse fracture of left patella, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Name of the Condition

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

Summary

This condition involves a horizontal break across the left kneecap (patella), a triangular bone that protects the knee joint. The fracture line runs perpendicular to the bone’s long axis, and the bone fragments remain aligned in their normal position (nondisplaced). The fracture is open, meaning the skin over the site is breached, and it is classified as type IIIA, IIIB, or IIIC (indicating increasing severity of soft tissue damage). The term "subsequent encounter" refers to follow-up care after the initial treatment, and "nonunion" indicates the fracture has failed to heal properly over time.

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 the fracture site to communicate with the external environment. Nonunion may result from inadequate initial treatment, poor blood supply to the bone, 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.
• Poorly managed open fractures, increasing the risk of infection and nonunion.

Symptoms

• Persistent pain in the left knee, often worsening with movement.
• Swelling and bruising around the kneecap that may not resolve.
• Inability to straighten the knee or bear weight, even after initial treatment.
• Visible deformity or a gap in the kneecap area.
• Signs of infection, such as redness, warmth, or drainage from the open wound site.

Diagnosis

A physical examination to assess knee movement, swelling, and tenderness. Imaging studies, typically X-rays, to confirm the fracture and evaluate bone alignment. A CT scan may be used to assess the fracture in detail, especially for nonunion. Blood tests may be ordered to check for infection or inflammation. Documentation of the open fracture type (IIIA, IIIB, or IIIC) and the presence of nonunion is critical for accurate coding.

Treatment Options

• Surgical intervention to stabilize the fracture, such as internal fixation with screws or plates, especially if nonunion is present.
• Debridement of the wound to remove infected or dead tissue, particularly for open fractures.
• Antibiotics to treat or prevent infection in open fractures.
• Bone grafting to promote healing in cases of nonunion.
• Physical therapy to restore knee function and strength after healing.

Prognosis and Follow-Up

Prognosis depends on the severity of the open fracture and the success of treatment for nonunion. Healing may be prolonged, and some patients may experience long-term knee stiffness or weakness. Regular follow-up appointments are necessary to monitor healing, assess for complications, and adjust treatment plans. Imaging studies may be repeated to evaluate bone union.

Complications

• Infection at the fracture site, especially with open fractures.
• Chronic pain or arthritis in the knee joint.
• Limited range of motion or stiffness.
• Nonunion or malunion (improper healing) of the fracture.
• Nerve or blood vessel damage in severe cases.

Lifestyle & Prevention

• Avoid high-impact activities until the fracture is fully healed and cleared by a healthcare provider.
• Use protective gear, such as knee pads, during sports or activities with a risk of injury.
• Maintain bone health through a balanced diet rich in calcium and vitamin D.
• Follow post-treatment instructions carefully to support healing and reduce complications.

When to Seek Professional Help

• Severe or worsening pain that is not relieved by rest or medication.
• Signs of infection, such as fever, redness, warmth, or drainage from the wound.
• Inability to bear weight on the left knee or straighten the leg.
• New or worsening deformity in the kneecap area.

Tips for Medical Coders

Document the laterality (left patella), fracture type (transverse, nondisplaced), encounter type (subsequent), open fracture classification (IIIA, IIIB, or IIIC), and the presence of nonunion. Ensure the open fracture type is clearly specified, as this impacts coding. Verify that the fracture is confirmed as nonunion, with supporting clinical or imaging evidence. Avoid assumptions about fracture severity; rely on documented details.