title: Influence of body mass index in revision total knee arthroplasty.
abstract: OBJECTIVE
  : To evaluate the influence of the body mass index (BMI) on the functional assessment of patients who underwent revision total knee arthroplasty (RTKA).
  
  
  METHODS
  : Thirty patients who un-derwent RTKA between January 2008 and January 2012 were retrospectively assessed using the WOMAC questionnaire. The patients were divided into three groups according to the BMI ca-tegories defined by the World Health Organization (WHO): Group I with normal BMI (18-24.9 Kg/m(2)), with eight patients; Group II, overweight (BMI 25-29.9 Kg/m(2)), with 15 patients, and Group III obesity with BMI ≥ 30 Kg/m(2), with seven patients. The post-ope-rative function scores obtained through the WOMAC questionnaire were compared with the BMI of each group. The statistical analysis between BMI and WOMAC scores was performed with the Spe-arman correlation test.
  
  
  RESULTS
  : The average functional WOMAC score for individuals in Group I was 16.7; in Group II it was 47.7; and in Group III it was 69.9, with a statistically significant differen-ce between groups I, II and III (p< 0.0001).
  
  
  CONCLUSIONS
  : Patients with BMI > 25 Kg/m(2) had a worse functional evaluation through WOMAC scores when compared to patients with normal BMI after RTKA. Level of Evidence III, Tranversal Retrospective Study.
authors.affiliation: Hospital do Servidor Público Estadual (HSPE), Orthopedics and Traumatology Service, São Paulo, SP, Brazil.
authors.forename: Rogério Teixeira
authors.initials: RT
authors.lastname: de Carvalho
authors.affiliation: Hospital do Servidor Público Estadual (HSPE), Orthopedics and Traumatology Service, São Paulo, SP, Brazil.
authors.forename: Diego Benone
authors.initials: DB
authors.lastname: Santos
authors.affiliation: Hospital do Servidor Público Estadual (HSPE), Orthopedics and Traumatology Service, São Paulo, SP, Brazil.
authors.forename: Victor
authors.initials: V
authors.lastname: Chammas
authors.affiliation: Hospital do Servidor Público Estadual (HSPE), Orthopedics and Traumatology Service, São Paulo, SP, Brazil.
authors.forename: Lucas Simões
authors.initials: LS
authors.lastname: Arrebola
authors.affiliation: Hospital do Servidor Público Estadual (HSPE), Orthopedics and Traumatology Service, São Paulo, SP, Brazil.
authors.forename: Mauricio Lebre
authors.initials: ML
authors.lastname: Colombo
authors.affiliation: Hospital do Servidor Público Estadual (HSPE), Orthopedics and Traumatology Service, São Paulo, SP, Brazil.
authors.forename: Caetano
authors.initials: C
authors.lastname: Scalizi
keywords: Arthroplasty, replacement, knee; Body mass index; Osteoarthritis, knee; Review