Biomechanical study of the sacroiliac fracture fixation with titanium rods and pedicle screws.
OBJECTIVES
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.


CONCLUSION
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.
['Ueno|Fabrício Hidetoshi|FH|', 'Pisani|Marina Justi|MJ|', 'Machado|André Nunes|AN|', 'Rodrigues|Fábio Lucas|FL|', 'Fujiki|Edison Noburo|EN|', 'Rodrigues|Luciano Miller Reis|LM|']
Fracture fixation Sacroiliac joint Pelvic bones