M00.169

Clinical Causes: Spread of pneumococcal bacteria to the knee joint through the bloodstream from a primary infection elsewhere in the body such as the lungs or sinuses. Direct invasion of the joint following trauma or injury that introduces bacteria into the joint space. Compromised immune system, which makes individuals more susceptible to infections. Pre-existing joint conditions or prosthetic joints that can provide a foothold for bacteria.

Key Symptoms: Severe knee pain that worsens with movement or touch. Swelling and warmth around the knee joint. Redness of the skin over the knee. Limited range of motion or difficulty moving the knee comfortably. Fever and chills, especially if the infection becomes systemic. Feeling of stiffness or inability to fully straighten or bend the knee.

Diagnosis Path: Diagnosis of pneumococcal arthritis involves a combination of clinical examination, laboratory tests, and imaging studies: - Physical examination to assess swelling, tenderness, and range of motion. - Blood tests to detect signs of infection and identify bacteria. - Joint aspiration: Synovial fluid is extracted from the knee and analyzed for bacteria, white blood cell count, and other markers. - Culture and Gram stain of the synovial fluid to identify Streptococcus pneumoniae. - Imaging studies such as X-rays or MRI to evaluate joint damage and rule out other causes.

Treatment Protocols: Managing pneumococcal arthritis requires prompt and aggressive treatment: - Antibiotics: Intravenous antibiotics targeted at Streptococcus pneumoniae are essential in eradicating the bacteria. - Joint drainage: Removal of infected fluid from the knee to reduce pressure and bacteria load. - Rest and elevating the affected limb to decrease swelling and pain. - Pain management with medications as advised by healthcare providers. - Physical therapy may be recommended to restore joint function after initial infection control. - In some cases, especially with significant joint damage, surgical intervention such as joint replacement may be considered. Early treatment is crucial to prevent permanent joint damage, stiffness, and the spread of infection to other parts of the body.