We present the findings of a prospective, bi-center study to establish the appropriate duration of antibiotic therapy for acute, uncomplicated bone and joint infections in children. Historically, patients have been treated with prolonged courses of intravenous and oral therapy. Our hypothesis was that children could be safely treated with 3 days of high-dose intravenous therapy followed by 3 weeks of oral therapy. We prospectively collected data from children presenting to Birmingham Children's Hospital and The Royal Children's Hospital, Melbourne who fitted our diagnostic criteria for septic arthritis and osteomyelitis over a 52-month period. Inclusion criteria for entry into the database were children