Introduction: Inflammation of joints caused by pyogenic bacteria causes septic arthritis. This is an emergency that requires immediate diagnosis and treatment. Delay causes cartilage and joint destruction, leading to significant morbidity and mortality. The prevalence of patients with septic arthritis who present to the emergency department varies widely between studies. Immunocompromised patients and those with artificial joints have a higher incidence of septic arthritis. Because x-rays are widely available, they are commonly used for imaging joints. MRI provides more accurate information about joint and adjacent soft tissue involvement