National Obesity Trends in Revision Total Knee Arthroplasty

Abstract Background The utilization of primary TKA in obese patients has increased significantly over the past decade despite overwhelming data that suggests higher failure rates. As such, it is reasonable to expect a parallel increase in obesity rates among revision total TKA (rTKA) patients. The purpose of this study was to analyze longitudinal trends in obesity rates among rTKA patients. Methods We identified 451,982 rTKA patients using 2002-2012 Nationwide Inpatient Sample weighted discharge data. The AHRQ obesity comorbidity indicator was to identify 70,470 obese patients (BMI > 30) and 335,257 non-obese patients. We evaluated trends in obesity rates over time using chi-square tests and a multivariate logistic regression model, which included several covariates (patient age, gender, and race, payer type, hospital type, and patient health status). Results The obesity rate among rTKA patients increased significantly from 9.74% in 2002 to 24.57% in 2012 (p