The risk of surgical site infection (SSI) is greater after revision hip arthroplasty than after primary procedures. While this is accepted as a clinical phenomenon, standardized surveillance strategies for healthcare-associated infections, including SSIs, do not currently take this into consideration. Most notably, the National Nosocomial Infections Surveillance (NNIS) risk index for stratification does not differentiate between primary and revision surgeries. Using data from a single US center, Leekha et al. recently demonstrated that the risk for SSI was almost twice as high after revision total hip arthroplasty when compared to primary total hip arthroplasty and that risk was even greater when deep incisional or organ/space infections were analyzed. The objective of this study was to compare SSI rates following primary and revision hip arthroplasty in a much larger Australian population to determine whether differences are accounted for by current risk indexing.