This document provides an overview of suppurative arthritis, including its epidemiology, etiology, clinical presentation, diagnosis, treatment, complications and prognosis. Suppurative arthritis is most common in young children under 5 years old and is usually caused by bacteria such as Staphylococcus aureus entering the bloodstream and infecting the joints. The key clinical sign is pain with passive motion of the joint. Diagnosis involves joint aspiration and culture. Treatment consists of intravenous antibiotics for 3-6 weeks along with surgery and physical therapy if needed. Complications can include osteonecrosis, premature osteoarthritis and growth abnormalities if not treated promptly.