Acta Ortopédica Brasileira (Jun 2015)

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

  • Fabrício Hidetoshi Ueno,
  • Marina Justi Pisani,
  • André Nunes Machado,
  • Fábio Lucas Rodrigues,
  • Edison Noburo Fujiki,
  • Luciano Miller Reis Rodrigues

DOI
https://doi.org/10.1590/1413-78522015230300970
Journal volume & issue
Vol. 23, no. 3
pp. 154 – 157

Abstract

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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.

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