DOS 2019

172 · DOS Abstracts Patient Reported Outcome and Body Mass Index in 3,327 total knee arthroplasty patients Anders Overgaard Parker Institute, Bispebjerg og Frederiksberg hospital Background: As the number of primary knee arthroplasties, as well as the number of obese patients undergoing total knee arthroplasty (TKA), continues to increase, there has been more interest in the role of obesity as a risk factor for poor outcomes after TKA. In the literature, the influence of obesity on knee arthroplasty outcome diverges. We compared pain, function, quality of life, gen- eral health preoperatively and 1 year postoperatively, in patients operated on with TKA for knee OA. Purpose / Aim of Study: Patient reported outcome (PRO) in total knee ar- throplasty (TKA) patients with high body mass index (BMI) is controversial. We compared pain, function, quality of life, general health and satisfaction among different BMI categories preoperatively and 1 year after primary TKA Materials and Methods: 4,318 patients were operated with a TKA for knee osteoarthritis in the Region of Skane 2013- 2015. 3,327 patients (77%) had complete PRO data and information on BMI and were included. Preoperatively the patients filled in the Knee injury and Osteoarthritis Outcome Score (KOOS) and EQ-VAS (general health). 1 year postoperatively the same questionnaires were filled in together with the question if they were satisfied with the surgery. Information on age, sex, BMI and ASA grade were obtained from the Swedish Knee Arthroplasty Register. Each patient was classified as Outcome Measures in Rheumatology - Osteoarthritis Research Society International (OMERACT- OARSI) responder or not based on a combination of absolute and relative chang- es in scores. Welch’s t-test and Chi2-test were used in the statistical analysis. Findings / Results: Both preoperatively and 1 year postoperatively the obese patients reported somewhat worse scores than normal- and over-weighted. The differences were small with 1 exception, the KOOS sport- and recreation function postoperatively where normal- and over-weighted patients reported fewer problems than obese patients with a BMI over 35 (40 and 39 points vs 31 points, p<0.001). Similar proportions of patients were satisfied and catego- rized as OMERACT-OARSI responders in the different BMI categories. Conclusions: The degree of improvement in PRO’s 1-year after TKA surgery does not seem to be affected by BMI. 128.