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this study was to assess the agreement between three common definitions of surgical woundinfection as a performance indicator in TKA; (a) the CDC 1992 definition, (b) the NINSSmodification of the CDC definition and (c) the ASEPSIS scoring method applied to the sameseries of surgical wounds.Methods:A prospective study of 500 surgical wounds in patients who underwent knee arthroplastiesbetween May 2002 and December 2004 from a single tertiary centre were assessed according tothe different definitions of surgical wound infection.Results:A total of 500 wounds were assessed in 482 patients. Mean age of patients was 70+/-11 years,61.6% were females, duration of surgery was 101+/-49 minutes and mean follow-up was35.2+/-25.7 months. The most commonly isolated species were Coagulase negativestaphylococci (33.3%), Staphylococcus aureus (25%) and Pseudomonas aeruginosa (16.6%).The mean percentage of wounds classified as infected differed substantially with differentdefinitions: 5.8% with the CDC definition, 3.6% with the NINSS version and 2.2% with anASEPSIS score > 20. When superficial infections (according to CDC category) were included,5.2% (26) of all observed wounds received conflicting diagnoses, and 1.4% (7) were classifiedas infected by both ASEPSIS and CDC definitions. When superficial infections were excluded,the two definitions estimated about the same overall percentage infection (2.2% and 2.6%respectively), but there were almost three times as many conflicting infection diagnoses (n =14) as concordant ones (n = 5).Conclusion:Distinctions in surgical wound infection definitions contribute to notable differences in howinfections are classified after TKA. Even small changes made to the CDC definition, as with theNINSS version, caused major variation in estimated percentage of wound infection. A singledefinition used consistently can show changes in wound infection rates over time at a singlecentre. However, differences in interpretation prevent comparison between different centres.Poster: 105Comparison of MIS-THA Versus Conventional-THA in Postero-LateralApproach*Toshiyuki Tateiwa - Tokyo Medical University - Tokyo, JapanKosuke Kubo - Tokyo Medical University - Tokyo, Japanfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]