S82.035Q Nondisplaced transverse fracture of left patella, subsequent encounter for open fracture type I or II with malunion

Name of the Condition

• Nondisplaced transverse fracture of left patella, subsequent encounter for open fracture type I or II with malunion

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 (type I or II), meaning the skin over the fracture site is breached but the wound is typically small and clean. The term "subsequent encounter" indicates this is a follow-up visit for the fracture, and "malunion" refers to incomplete or abnormal healing of the bone.

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. Malunion may result from inadequate initial treatment, poor blood supply, or excessive movement during healing.

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.
• Delayed or inadequate initial fracture management.

Symptoms

• Persistent pain in the left 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.
• A "popping" sensation at the time of injury (if recent).
• Possible signs of malunion, such as abnormal knee alignment or reduced range of motion.

Diagnosis

A physical examination to assess knee movement, swelling, and tenderness. Imaging studies, typically X-rays, to confirm the fracture and evaluate bone alignment. In some cases, a CT scan may be used to assess malunion or the extent of the open fracture. Clinical evaluation of the wound (for open fracture) and review of prior treatment history are also important.

Treatment Options

• Immobilization with a cast or brace to stabilize the knee and promote healing.
• Pain management with medications or physical therapy.
• Surgical intervention may be considered for severe malunion or functional impairment.
• Wound care for the open fracture site to prevent infection.
• Rehabilitation exercises to restore strength and range of motion.

Prognosis and Follow-Up

Prognosis depends on the severity of malunion and the patient’s overall health. Most patients recover with proper treatment, though malunion may lead to long-term knee stiffness or weakness. Follow-up visits are necessary to monitor healing, assess function, and adjust treatment as needed. Physical therapy is often recommended to improve mobility and strength.

Complications

• Infection at the fracture site (especially with open fractures).
• Chronic pain or arthritis in the knee.
• Reduced range of motion due to malunion.
• Delayed healing or nonunion of the fracture.
• Nerve or blood vessel damage near the knee.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports or activities with a risk of knee injury.
• Maintain bone health through a balanced diet and regular exercise.
• Follow post-treatment instructions carefully to support proper healing.
• Attend all follow-up appointments to monitor progress.

When to Seek Professional Help

• Severe or worsening pain that does not improve with rest or medication.
• Increased swelling, redness, or drainage from the fracture site.
• Inability to bear weight on the left knee.
• Signs of infection, such as fever or chills.
• Sudden changes in knee alignment or function.

Tips for Medical Coders

Document the fracture type (open, type I or II), the presence of malunion, and the subsequent encounter status clearly. Include details about the fracture’s alignment (nondisplaced) and any contributing factors, such as prior treatment or healing complications. Ensure the code S82.035Q is used only when the fracture is a follow-up for an open fracture with malunion, and verify that all clinical criteria are met for accuracy.