S82.035K Nondisplaced transverse fracture of left patella, subsequent encounter for closed fracture with nonunion

Name of the Condition

• Nondisplaced transverse fracture of left patella, subsequent encounter for closed fracture 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 without displacement. The term "subsequent encounter" indicates this is a follow-up visit for a fracture that has not healed (nonunion) after an initial treatment period. "Closed fracture" means the skin over the fracture site remains intact, and the nonunion signifies a failure of the bone to unite 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. Nonunion may occur due to inadequate immobilization, poor blood supply to the bone, infection, or excessive movement at the fracture site 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.
• Smoking or poor nutrition, which can impair bone healing.

Symptoms

• Persistent pain in the left knee, often worsening with activity.
• Swelling and bruising around the kneecap that does not resolve over time.
• Inability to fully straighten the knee or bear weight.
• A noticeable gap or abnormal movement at the fracture site.
• A "popping" or grinding sensation when moving the knee.

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 or MRI may be used to assess bone healing and rule out other injuries. The diagnosis of nonunion is confirmed when imaging shows no evidence of bone union after an appropriate healing period.

Treatment Options

• Immobilization with a cast or brace to stabilize the fracture and promote healing.
• Surgical intervention, such as internal fixation with screws or plates, to realign and secure the bone fragments.
• Bone grafting to stimulate bone growth and healing.
• Physical therapy to restore strength and range of motion once the fracture is stable.
• Pain management with medications or other modalities.

Prognosis and Follow-Up

The prognosis depends on the severity of the nonunion and the effectiveness of treatment. With proper intervention, many patients achieve successful healing and return to normal function. Follow-up visits are necessary to monitor progress, typically with repeat imaging to assess bone union. Long-term outcomes may include residual stiffness or weakness, which can be managed with ongoing therapy.

Complications

• Chronic pain or instability in the knee.
• Arthritis in the knee joint due to altered mechanics.
• Infection, particularly if surgery is required.
• Nerve or blood vessel damage near the fracture site.
• Difficulty returning to pre-injury activities.

Lifestyle & Prevention

• Avoid high-impact activities until the fracture is fully healed.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Quit smoking, as it impairs bone healing.
• Use protective gear during sports or activities with a risk of knee injury.
• Follow post-treatment guidelines closely to minimize the risk of nonunion.

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, swelling, or inability to bear weight on the left knee. Contact your healthcare provider if symptoms worsen or do not improve with treatment, or if you notice signs of infection, such as redness, warmth, or drainage at the fracture site.

Tips for Medical Coders

Document the encounter as a subsequent visit for a closed fracture with nonunion. Ensure the record specifies the fracture type (nondisplaced transverse), laterality (left), and the presence of nonunion. Include details about the fracture’s history, treatment history, and any imaging or clinical findings that confirm nonunion. The code S82.035K requires clear documentation of the nonunion and the closed nature of the fracture to support accurate coding.