M00.26 Other streptococcal arthritis, knee

Name of the Condition

• Other streptococcal arthritis, knee

Summary

Other streptococcal arthritis, knee, is a bacterial infection of the knee joint caused by streptococcal bacteria other than Streptococcus pneumoniae. It results in joint inflammation and can lead to rapid joint damage if not treated promptly. This condition requires immediate medical attention to prevent complications.

Causes

Other streptococcal arthritis, knee, is caused by infection with streptococcal bacteria (excluding Streptococcus pneumoniae) in the knee joint space. The infection can spread through the bloodstream from a distant site, such as the skin or respiratory tract, or via direct inoculation into the joint.

Risk Factors

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

Symptoms

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

Treatment Options

Treatment typically includes intravenous antibiotics to target the streptococcal infection, often followed by oral antibiotics. Joint drainage may be necessary to reduce pressure and remove infected fluid. Pain management and physical therapy may support recovery.

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 treatment as needed. Delayed treatment increases the risk of complications.

Complications

• Permanent joint damage or deformity.
• Sepsis or systemic infection.
• Chronic arthritis.
• Spread of infection to surrounding tissues.

Lifestyle & Prevention

• Maintain good hygiene to reduce infection risk.
• Manage chronic conditions (e.g., diabetes) to support immune function.
• Seek prompt care for skin or respiratory infections.
• Avoid invasive joint procedures unless medically necessary.

When to Seek Professional Help

Seek immediate medical attention if you experience severe knee pain, swelling, fever, or reduced mobility. Early intervention is critical to prevent complications.

Tips for Medical Coders

Document the specific joint affected (knee) and confirm the causative organism is streptococcal (excluding Streptococcus pneumoniae). Include details of diagnostic tests (e.g., synovial fluid analysis, imaging) and treatment interventions to support accurate coding.