title: THE INFLUENCE OF THE SURGICAL APPROACH CONCERNING DISLOCATION IN TOTAL HIP ARTHROPLASTY.
abstract: OBJECTIVE
  Our primary aim was to evaluate the occurrence of dislocation of non-cemented total hip arthroplasty, when using the posterior and the direct lateral approaches.
  
  
  METHODS
  We performed a comparative retrospective study with 232 patients submitted to non-cemented total hip arthroplasty, due to the diagnosis of primary or secondary osteoarthritis. The posterior approach was used in 105 patients while direct lateral approach was used in 127 patients. There was only one prosthesis model and the same rehabilitation program and post-operative care was used for all patients. We checked the occurrence of dislocation, the acetabular positioning and also the size of the components.
  
  
  RESULTS
  There was only one case of dislocation, treated with closed reduction successfully. This was a 47 year-old female, submitted to direct lateral approach. The mean follow-up time for both groups was 23.7 months, ranging from six to 42 months.
  
  
  CONCLUSIONS
  The authors conclude that the prevalence of total hip arthroplasty dislocation is similar for both approaches, and educational measures besides the use of a higher femoral offset seem to reduce the risk of this complication.
authors.affiliation: Associate Professor, USP School of Medicine, Hip and Arthroplasty Group Assistant, Institute of Orthopedics and Traumatology, HC/FMUSP.
authors.forename: José Ricardo Negreiros
authors.initials: JR
authors.lastname: Vicente
authors.affiliation: Resident of the Institute of Orthopedics and Traumatology, HC/FMUSP.
authors.forename: André Fernandes
authors.initials: AF
authors.lastname: Pires
authors.affiliation: Resident of the Institute of Orthopedics and Traumatology, HC/FMUSP.
authors.forename: Bruno Takasaki
authors.initials: BT
authors.lastname: Lee
authors.affiliation: Hip and Arthroplasty Group Volunteer Assistant, Institute of Orthopedics and Traumatology, HC/FMUSP.
authors.forename: Marcos Camargo
authors.initials: MC
authors.lastname: Leonhardt
authors.affiliation: Doctor of Specialized Complementary Medicine, Hip and Arthroplasty Group, Institute of Orthopedics and Traumatology, HC/FMUSP.
authors.forename: Leandro
authors.initials: L
authors.lastname: Ejnisman
authors.affiliation: Associate Professor, USP School of Medicine, Head of the Hip and Arthroplasty Group, Institute of Orthopedics and Traumatology, HC/FMUSP.
authors.forename: Alberto Tesconi
authors.initials: AT
authors.lastname: Croci
keywords: Arthroplasty; Hip; Hip dislocation