Comparação da resistência mecânica pela osteossíntese com placas fixadas nas posições lateral e posterior em fraturas Danis-Weber B.: estudo experimental

Abstract

ObjectiveThe purpose of this study was to compare two different positions of the plate: lateral platting and posterior antiglide platting in lateral malleolar Danis-Weber B fractures on synthetic bone. MethodsShort oblique fractures of distal fibula at the level of the syndesmosys were simulated with a fibular osteotomy, in sixteen synthetic fibula bones (Synbone®). Eight fractures were fixed with lateral platting associated to an independent lag screw and the other eight were fixed with a posterior antiglide platting with a lag screw through the plate. A strain gage was installed at the center of each plate at the osteotomy site. Supination and external rotation forces were applied to each model of the two groups on the bend. ResultsThe lateral position plate group suffered more deformation in supination forces compared to the group with posterior antiglide plate, but without statistical significance. In the tests with external rotation forces, the posterior antiglide platting group showed statistically more resistance (p < 0.05). ConclusionThe osteosynthesis with posterior antiglide plate models simulating type B fractures of the lateral malleolus of the ankle is more resistant than the neutralization plate, when subjected to external rotation forces.