title: Biomechanical study of the sacroiliac fracture fixation with titanium rods and pedicle screws.
abstract: OBJECTIVE
  To assess biomechanically different fixations means of the sacroiliac joint with pedicle screws and to compare the traditional head height with reduced ones.
  
  
  METHODS
  We used a polyethylene model representing the pelvic ring and simulated a unilateral sacroiliac dislocation. We set up three different constructions: 1) two screws attached to a rod; 2) two rods connected to two small head screws each; and 3) two rods connected to two average headed screws each. We conducted tests in a biomechanical testing and a mechanized processing laboratory.
  
  
  RESULTS
  Group 1 supported an average maximum load of 99.70 N. Group 2 supported an average maximum load of 362.46 N. Group 3 endured an average maximum load of 404.15 N. In the assembly with one rod, the resistance decreased as compared with the one with two bars: 72.5 % compared to small-headed screws and 75.3 % to the traditional screw.
  
  
  CONCLUSIONS
  The assembly with a single bar presented inferior results when compared to the double bar assembly. There was no statistical difference in the results between the screws used. Experimental Study.
authors.affiliation: Faculdade de Medicina do ABC, Santo André, SP, Brazil.
authors.forename: Fabrício Hidetoshi
authors.initials: FH
authors.lastname: Ueno
authors.affiliation: Faculdade de Medicina do ABC, Santo André, SP, Brazil.
authors.forename: Marina Justi
authors.initials: MJ
authors.lastname: Pisani
authors.affiliation: Faculdade de Medicina do ABC, Santo André, SP, Brazil.
authors.forename: André Nunes
authors.initials: AN
authors.lastname: Machado
authors.affiliation: Faculdade de Medicina do ABC, Santo André, SP, Brazil.
authors.forename: Fábio Lucas
authors.initials: FL
authors.lastname: Rodrigues
authors.affiliation: Faculdade de Medicina do ABC, Santo André, SP, Brazil.
authors.forename: Edison Noburo
authors.initials: EN
authors.lastname: Fujiki
authors.affiliation: Faculdade de Medicina do ABC, Santo André, SP, Brazil.
authors.forename: Luciano Miller Reis
authors.initials: LM
authors.lastname: Rodrigues
keywords: Fracture fixation; Pelvic bones; Sacroiliac joint