M00.06 Staphylococcal arthritis, knee

Name of the Condition

• Staphylococcal Arthritis, Knee

Summary

Staphylococcal arthritis, knee, is a bacterial infection affecting the knee joint, caused by Staphylococcus bacteria. It results in rapid inflammation, pain, and potential joint damage if not treated promptly. This condition requires immediate medical attention to prevent complications.

Causes

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

Risk Factors

• Recent knee surgery or invasive procedures.
• Immunocompromised states (e.g., diabetes, HIV, chemotherapy).
• Intravenous drug use.
• Pre-existing knee conditions (e.g., rheumatoid arthritis).
• Skin infections or bacteremia.

Symptoms

• Severe knee pain, swelling, and warmth.
• Fever and chills.
• Reduced range of motion in the affected knee.
• Fatigue and malaise.
• Redness over the knee.

Diagnosis

Diagnosis involves knee 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 necessary to remove infected fluid and reduce pressure.
• Supportive Care: Rest, immobilization, and pain management are often used alongside antibiotics.

Prognosis and Follow-Up

With prompt treatment, most patients recover without long-term joint damage. Follow-up care includes monitoring for recurrence, assessing joint function, and adjusting antibiotic therapy as needed. Delayed treatment increases the risk of permanent joint damage or systemic infection.

Complications

• Permanent joint damage or arthritis.
• Septic shock.
• Spread of infection to other parts of the body.
• Chronic pain or reduced mobility.

Lifestyle & Prevention

• Practice good hygiene to reduce infection risk.
• Properly care for skin wounds or injuries.
• Manage underlying conditions (e.g., diabetes) to support immune function.
• 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 serious infection requiring urgent care.

Tips for Medical Coders

Document the specific joint (knee) and confirm the bacterial cause (Staphylococcus) to support accurate coding. Include details on diagnosis methods (e.g., joint aspiration, imaging) and treatment approaches (e.g., antibiotics, drainage) for clinical specificity.