M00.261

Clinical Causes: Infection with streptococcal bacteria, typically Streptococcus pyogenes or Streptococcus agalactiae. Spread of bacteria from another site of infection, such as the skin or throat, into the bloodstream and subsequently into the knee joint. Direct inoculation of bacteria into the joint through trauma or surgery. Immunocompromised states, which increase susceptibility to bacterial infections.

Key Symptoms: Intense pain in the right knee, especially with movement or pressure. Swelling and warmth around the joint. Redness of the skin over the affected knee. Reduced range of motion due to pain and swelling. Fever and chills, indicating systemic infection. General feeling of malaise or fatigue. Possible warmth or throbbing sensation in the joint.

Diagnosis Path: To confirm the presence of streptococcal arthritis in the right knee, healthcare providers typically perform several assessments including: - Physical examination to evaluate swelling, redness, warmth, and pain. - Blood tests to identify elevated white blood cell count and markers of inflammation such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR). - Joint aspiration (arthrocentesis) where synovial fluid is extracted for microscopic analysis, culture, and Gram staining to identify the specific bacteria. - Imaging studies such as X-rays or MRI to assess joint damage and rule out other causes of joint pain.

Treatment Protocols: Managing streptococcal arthritis of the right knee typically involves: - Antibiotic therapy tailored to the specific streptococcal strain, often administered intravenously at the start. - Rest and elevation of the affected knee to reduce swelling. - Pain management with medications such as NSAIDs. - In cases of significant joint damage or persistent infection, surgical intervention may be necessary to drain purulent fluid or perform joint debridement. - Close monitoring for complications, including joint destruction or spread of infection. - After initial treatment, a course of oral antibiotics may be prescribed to ensure complete eradication of the bacteria.