S72.453N Displaced supracondylar fracture without intracondylar extension of lower end of unspecified femur, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Name of the Condition

• Displaced supracondylar fracture without intracondylar extension of lower end of unspecified femur, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion

Summary

This condition involves a displaced fracture at the distal (lower) end of the femur, specifically in the supracondylar region (above the condyles). The fracture does not extend into the intracondylar area (the space between the condyles), distinguishing it from more complex knee joint fractures. Displacement means the bone fragments are out of their normal alignment, potentially affecting knee stability and function. This is a subsequent encounter for an open fracture (type IIIA, IIIB, or IIIC), indicating significant soft tissue damage and a break in the skin, with nonunion, meaning the fracture has failed to heal properly after an expected time.

Causes

High-impact trauma, such as falls, motor vehicle accidents, or direct blows to the thigh. Sports injuries or physical altercations involving force to the knee or thigh. Stress fractures from repetitive overuse or strenuous activity, though less common for this specific type. Open fractures may result from trauma that penetrates the skin, increasing infection risk.

Risk Factors

• Advanced age, which may lead to decreased bone density.
• Osteoporosis or other bone-weakening conditions.
• Participation in high-risk activities or contact sports.
• Prior history of femur fractures or bone disorders.
• Poor blood supply to the fracture site, which can contribute to nonunion.

Symptoms

• Severe pain in the knee or thigh area.
• Swelling, bruising, or visible deformity around the knee.
• Inability to bear weight or move the knee joint properly.
• Possible numbness or tingling if nerves are involved.
• Open wound with exposed bone or soft tissue (for open fractures).
• Persistent pain or instability indicating nonunion.

Diagnosis

Physical examination to assess pain, swelling, deformity, and range of motion. Imaging studies, such as X-rays, to confirm the fracture type, displacement, and nonunion. CT or MRI scans may be used to evaluate soft tissue damage or assess healing. Evaluation of the open wound for contamination or infection. Assessment of blood flow and nerve function to rule out vascular or neurological injury.

Treatment Options

Surgical intervention is often required to realign the bone fragments and stabilize the fracture, especially for open fractures with nonunion. Internal fixation with plates, screws, or rods may be used. External fixation devices may be necessary for severe soft tissue damage. Antibiotics to prevent or treat infection in open fractures. Bone grafting or other procedures to promote healing in cases of nonunion. Physical therapy to restore function and strength after healing.

Prognosis and Follow-Up

Prognosis depends on the severity of the fracture, soft tissue damage, and response to treatment. Open fractures with nonunion may have a longer recovery time and higher risk of complications. Regular follow-up with imaging to monitor healing and assess for nonunion. Physical therapy to improve mobility and strength. Long-term monitoring for arthritis or other joint issues.

Complications

• Infection, especially with open fractures.
• Nonunion or delayed healing.
• Malunion (improper healing leading to deformity).
• Nerve or vascular damage.
• Arthritis or stiffness in the knee joint.
• Chronic pain or instability.

Lifestyle & Prevention

Avoid high-risk activities that may lead to trauma. Use protective equipment during sports or work. Maintain bone health through a balanced diet rich in calcium and vitamin D. Engage in regular weight-bearing exercise to strengthen bones. Follow post-treatment guidelines to support healing and prevent re-injury.

When to Seek Professional Help

Seek immediate medical attention for severe pain, visible deformity, or an open wound. Contact a healthcare provider if symptoms worsen, or if there is persistent pain, swelling, or inability to move the knee after treatment. Report signs of infection, such as fever, redness, or drainage from the wound.

Tips for Medical Coders

Document the fracture type (supracondylar, no intracondylar extension), the encounter type (subsequent), the open fracture classification (IIIA, IIIB, or IIIC), and the presence of nonunion. Include details on the treatment provided, such as surgical intervention or bone grafting, and any complications like infection. Ensure documentation supports the specific code S72.453N by confirming the fracture location, displacement, open wound status, and nonunion.