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

• Published in: Acta ortopedica brasileira Vol. 23; no. 3; pp. 154 - 157
• Main Authors: Ueno, Fabrício Hidetoshi, Pisani, Marina Justi, Machado, André Nunes, Rodrigues, Fábio Lucas, Fujiki, Edison Noburo, Rodrigues, Luciano Miller Reis
• Format: Journal Article
• Language: English
• Published: Brazil Sociedade Brasileira de Ortopedia e Traumatologia 01-06-2015; ATHA EDITORA
• Subjects: Fracture fixation; Original; ORTHOPEDICS; Pelvic bones; Sacroiliac joint; Pelvic bones; Fracture fixation; Sacroiliac joint
• ISSN: 1413-7852; 1809-4406; 1413-7852; 1809-4406
• DOI: 10.1590/1413-78522015230300970

To assess biomechanically different fixations means of the sacroiliac joint with pedicle screws and to compare the traditional head height with reduced ones.
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.
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.
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.