M00.09

Clinical Causes: Bacterial spread through the bloodstream from a primary infection elsewhere in the body Direct infection due to a penetrating injury or surgical procedure involving a joint Existing skin infections, such as boils or abscesses, that release bacteria into the bloodstream Compromised immune defenses that allow bacteria to invade tissues more easily, especially in individuals with diabetes, HIV, or on immunosuppressive therapy

Key Symptoms: Joint pain and tenderness, often involving multiple joints (polyarthritis) Swelling around affected joints Warmth and redness over the joint areas Limited range of motion or stiffness in the joints Fever and chills, indicating systemic infection Fatigue and malaise Possible signs of infection at the site of entry if trauma or skin infection is present

Diagnosis Path: Physical examination to assess joint swelling, warmth, and tenderness Blood tests to detect signs of infection such as elevated white blood cell count and C-reactive protein levels Blood culture to identify the specific bacteria causing infection Joint aspiration, where a sample of synovial fluid is taken from the affected joint for laboratory analysis Synovial fluid analysis, including Gram staining and bacterial culture, to confirm the presence of Staphylococcus aureus Imaging studies like X-rays, ultrasound, or MRI to evaluate joint damage and rule out other causes of joint pain

Treatment Protocols: Intravenous antibiotics targeted at Staphylococcus aureus, often administered over several weeks Surgical drainage of joint fluid if abscesses or pus accumulation are present Rest and immobilization of affected joints to reduce pain and prevent further damage Pain management with analgesics as recommended by a healthcare provider Monitoring for complications like joint destruction or spread of infection to other tissues Addressing underlying conditions, such as controlling blood sugar in diabetics or reducing immunosuppressive medication if feasible