“…It is associated with a series of predisposing factors, such as rheumatoid arthritis, diabetes, immunosuppressant therapies, intravenous drug addiction, previous joint trauma, head and neck surgery, and subclavian vein catheterization. 3 To reach a definitive diagnosis, however, it is necessary to culture the microorganism involved in the bone fragment, joint fluid, or blood culture. Septic arthritis due to gram-negative germs, as in the case of our patient, are less common and usually appear in patients with chronic diseases that weaken the immune system, such as diabetes mellitus, cirrhosis of the liver and cancer.…”