382. Difference in Pathogens Between Hip and Knee Prosthetic Joint Infection

Abstract

BackgroundThere is contradicting evidence characterizing the difference in pathogens that cause hip and knee prosthetic joint infection (PJI). A possible difference in microbiology may inform choice in antibiotic etiology, prophylaxis, and empiric treatment. We sought to analyze a large cohort of PJIs to see whether there was a significant difference in pathogen between joints.MethodsA retrospective cohort of hip and knee PJIs, from 2008 to 2016, were identified by ICD code and surgical codes. The PJI pathogen was identified from synovial or intra-articular tissue cultures. The Student’s t-test was used to compare continuous variables. Chi-square tests were used to compare the categorical variables to joint.Results807 PJI cases were identified including 444 knees and 363 hips. There were no significant differences between hip and knee PJIs in age, sex, history of PJI, rheumatoid arthritis, Charlson comorbidity index and laterality. There was a higher frequency of diabetes in knee PJIs (25.3%) compared with hip PJIs (15.7%), P < 0.001. No significant difference was found in the prevalence of fungal, staphylococcal (including Staphylococcus aureus), streptococcal, or enterococcal pathogens between hip and knee PJIs.ConclusionIn this single-center cohort, hip and knees PJIs are infected with similar pathogens. Multiple site studies are needed to characterize the microbiology of PJIs at a larger scale.Disclosures All authors: No reported disclosures.