Socioeconomic Disparities in Method of Anesthesia for Knee Arthroplasties in the US

Introduction. Knee arthroplasty (KA) can be performed using general anesthe-sia (GA), neuraxial anesthesia (NA) or regional anesthesia (RA). We believe proportion of types of anesthetics have changed but that there is a disparity based on socioeconomic factors. Methods. Unadjusted rates and adjusted odds ratios for the use of RA or PNB were compared between groupings of patients based on socioeconomic status. Results. General anesthesia is the most common (49.7%) while NA (39.4%) and RA (10.9%) were the second and third. University hospitals and patient home ZIP Code median income had the strongest association with RA as a (adjusted odds ratio (AOR) 26.3, 95% confidence interval (95%CI) 22.1- 31.3, p<.01 and AOR 7.58, 95% CI 7.20- 7.98, p<.01). Conclusion. General anesthesia is the most common but the rate of alternative forms of primary anes-thesia type have changed over time. Disparities exist in anesthesia care which are associated with income levels.