title: Evaluating the effect of obesity on total knee arthroplasty: A longitudinal study.
abstract: OBJECTIVE
  To evaluate the effect of obesity on total knee arthroplasty, and on patient-reported outcomes.
  
  
  METHODS
  The longitudinal study was conducted from September 2013 to August 2015 at The Second Hospital of Jinlin University, Changchun, Jinlin, China, a tertiary hospital. Using universal sampling method, all patients who underwent elective total knee arthroplasty were included in the study. Data was collected using a semi-structured questionnaire, Oxford Knee Score, and Short Form 12 Questionnaire. SPSS 19 was used for statistical analysis.
  
  
  RESULTS
  Of the 183 patients, 104(57%) were obese and 79(43%) were non-obese. The mean age was 63.7 ± 8.4 years and 65.0 ± 8.8 years in obese and normal patients respectively (p=0.31). A statistically significant association was observed with regard to Oxford knee score in both groups of patients (p<0.05). Overall, 7(8.9%) patients from the non-obese category and 23(22.1%) from the obese category presented with local complications, while another 7(3.8%) patients had to undergo a revised surgery.
  
  
  CONCLUSIONS
  It is very important to equate the outcomes of the surgery in obese and normal individuals.
authors.affiliation: Department of Orthopaedics, The Second Hospital of Jinlin University, Changchun, Jinlin, China.
authors.forename: You-Bo
authors.initials: YB
authors.lastname: Ji
authors.affiliation: Hallym University, Chuncheon, Gangwon-do, Korea.
authors.forename: Chen-Yu
authors.initials: CY
authors.lastname: Wang
authors.affiliation: Department of Orthopaedics, The Second Hospital of Jinlin University, Changchun, Jinlin, China.
authors.forename: Xiao-Nan
authors.initials: XN
authors.lastname: Wang
authors.affiliation: Department of Orthopaedics, The Second Hospital of Jinlin University, Changchun, Jinlin, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Jin
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000706:statistics & numerical data*; D015992:Body Mass Index; D016022:Case-Control Studies; D002681:China; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology*; D011183:Postoperative Complications / Q000453:epidemiology; D016896:Treatment Outcome
keywords: Total knee arthroplasty, Obesity, Body mass index, Oxford Knee Score. 