M00.061 Staphylococcal arthritis, right knee

Name of the Condition

• Staphylococcal Arthritis, Right Knee
• Also known as septic arthritis or infectious arthritis when caused by Staphylococcus bacteria.

Summary

Staphylococcal arthritis is a bacterial infection in the right knee joint, leading to rapid inflammation, pain, and potential joint damage. Prompt medical intervention is essential to prevent complications and preserve joint function.

Causes

Staphylococcal arthritis is primarily caused by infection with Staphylococcus bacteria, most commonly Staphylococcus aureus. The bacteria can enter the joint through direct inoculation (e.g., injury or surgery), spread from nearby infections, or via the bloodstream from a distant site.

Risk Factors

• Joint surgeries or replacement.
• Immunocompromised conditions (e.g., diabetes, HIV).
• Intravenous drug use.
• Pre-existing joint damage or arthritis.
• Skin infections or bacteremia.

Symptoms

• Severe pain in the right knee.
• Swelling and warmth over the joint.
• Fever and chills.
• Reduced range of motion in the affected knee.
• Redness over the joint.

Diagnosis

Diagnosis involves joint aspiration to analyze synovial fluid for bacteria, blood cultures to identify systemic infection, and imaging (e.g., X-rays, MRI) to assess joint damage. Clinical evaluation and patient history are also critical.

Treatment Options

• Antibiotics: Intravenous antibiotics are crucial to eliminating the bacterial infection.
• Joint Drainage: Repeated needle drainage, arthroscopy, or open surgery may be required to remove infected fluid and reduce pressure.
• Supportive Care: Pain management, rest, and physical therapy to maintain joint mobility.

Prognosis and Follow-Up

With early and appropriate treatment, most patients recover without permanent joint damage. Follow-up care includes monitoring for recurrence, assessing joint function, and adjusting antibiotics as needed. Delayed treatment increases the risk of chronic arthritis or joint destruction.

Complications

• Permanent joint damage or arthritis.
• Sepsis (systemic infection).
• Osteomyelitis (bone infection).
• Reduced mobility or disability.

Lifestyle & Prevention

• Practice good hygiene to prevent skin infections.
• Promptly treat any cuts or wounds.
• Manage chronic conditions (e.g., diabetes) to reduce infection risk.
• Avoid intravenous drug use.

When to Seek Professional Help

Seek immediate medical attention if you experience severe knee pain, swelling, fever, or reduced mobility, as these may indicate a joint infection requiring urgent care.

Tips for Medical Coders

Document the specific joint (right knee) and confirm the bacterial cause (Staphylococcus) to support accurate coding. Include details of joint aspiration, imaging, and antibiotic therapy in the medical record for clear code assignment.