There are very few literature data from the last two decades on the rate of complications following septic arthritis in children. This retrospective chart review shows that 10% of children admitted for septic arthritis to our institution suffered from clinically significant complications at 12 months following diagnosis. Forty-four children met our inclusion criteria, of whom 59% were male and 57% were culture positive. The most common causative organism was Staphylococcus aureus (76%), of which only 8% were methicillin-resistant S. aureus. Poor prognostic factors were culture positivity, infancy (<2 years) and male sex. Our rate of dysfunction is lower than most published rates, which have historically been in the range 15 to 49% in developed countries.