title: Comparison of total hip arthroplasty in osteoarthritis of mechanical and rheumatologic causes.
abstract: OBJECTIVE
  To compare the use of uncemented implants in total hip arthroplasty in patients with rheumathologic diseases and mechanical osteoarthrosis.
  
  
  METHODS
  We retrospectively evaluated 196 patients who were operated by the Hip and Arthroplasty Surgery Group of the IOT-HCFMUSP between 2005 and 2009. Patients were divided into two groups: mechanical causes (165 patients) and rheumathologic causes (31 patients). Groups were compared between each other in age, gender and follow-up time. Osseointegration rate and percentage of failure in arthroplasty were evaluated.
  
  
  RESULTS
  No statistically significant difference was found in osseointegration rates (in both femoral and acetabular components) in both groups. The rates of revision surgery and implant survival also did not show statistically significant differences.
  
  
  CONCLUSIONS
  The use of uncemented total hip arthroplasty did not show worse results in rheumathologic patients. Level of Evidence III, Retrospective Case Control Study.
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, São Paulo, SP, Brasil, Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: Leandro
authors.initials: L
authors.lastname: Ejnisman
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, São Paulo, SP, Brasil, Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: Nathalia Zalc
authors.initials: NZ
authors.lastname: Leonhardt
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, São Paulo, SP, Brasil, Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: Laura Fillipini Lorimier
authors.initials: LF
authors.lastname: Fernandes
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, São Paulo, SP, Brasil, Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: Marcos de Camargo
authors.initials: Mde C
authors.lastname: Leonhardt
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, São Paulo, SP, Brasil, Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: José Ricardo Negreiros
authors.initials: JR
authors.lastname: Vicente
authors.affiliation: Universidade de São Paulo, Faculdade de Medicina, São Paulo, SP, Brasil, Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: Alberto Tesconi
authors.initials: AT
authors.lastname: Croci
keywords: Arthritis, rheumatoid; Arthroplasty, replacement, hip; Cementation; Osseointegration