M00.269

Clinical Causes: Bacterial Infection: The primary cause is the spread of streptococci bacteria, often originating from infections elsewhere in the body such as the throat or skin. Bloodstream Spread: Bacteria can enter the bloodstream (bacteremia) and reach the knee joint, leading to infection. Direct Inoculation: Less commonly, bacteria can be directly introduced into the knee through trauma, surgery, or injection procedures. Weakened Immune System: Individuals with compromised immune systems, chronic illnesses, or those who are elderly may be more susceptible. Pre-existing Conditions: Conditions like rheumatoid arthritis or other joint diseases can predispose the knee to infections.

Key Symptoms: Severe knee pain, often worsening with movement Swelling and redness around the knee joint Warmth sensation in the affected area Limited range of motion due to pain and swelling Fever and chills in some cases General feeling of unwellness or fatigue

Diagnosis Path: Diagnosing streptococcal arthritis involves several steps to confirm infection and identify the causative bacteria: - Physical examination to assess swelling, warmth, and joint tenderness. - Blood tests to detect infection markers such as elevated white blood cell count or C-reactive protein. - Joint fluid analysis: Arthrocentesis involves extracting fluid from the knee to examine for bacteria, white blood cells, and other signs of infection. - Cultures of blood and synovial fluid to identify streptococcal bacteria. - Imaging tests like X-rays or MRI scans may help rule out other joint problems and evaluate damage. Prompt diagnosis is crucial to initiate appropriate treatment and prevent joint damage.

Treatment Protocols: Treating streptococcal arthritis typically involves a combination of approaches: - Antibiotics: The primary treatment is the administration of antibiotics effective against streptococci bacteria. The route can be oral or intravenous, depending on severity. - Joint Drainage: Removing infected fluid from the joint (joint aspiration) can help reduce pressure and bacterial load. - Rest and Immobilization: Limiting movement of the affected knee to prevent further injury. - Pain Management: Use of analgesics to alleviate discomfort. - Surgery: In severe cases, surgical intervention may be necessary to clean out the joint or repair damaged tissues. - Monitoring and Follow-up: Regular assessments to ensure infection resolution and prevent recurrence. Early treatment is essential to minimize joint destruction and preserve function.