Per: VINICIUS OLIVEIRA DOS SANTOS (LEBm/HU-UFSC), Patricia Ortega Cubillos (LEBM/HU-UFSC), Claudio Teodoro dos Santos (INT), Wellington Gilbert Fernandes (INT), Ieda Maria Vieira Caminha (INT), Maurício de Jesus Monteiro (INT), Carlos Rodrigo de Melo Roesler (LEBm/HU-UFSC)
Abstract:
The fretting-corrosion mechanism in the stem-head and stem-cement interface generate metallic debris and ions, that can increase the incidence of adverse events, as a failure of the implants or adverse tissue reactions. This has motivated several authors to investigate the causes of this mechanism in hip prosthesis. The present work aims to identify which interface, stem-head or stem-cement, is the most affected by the fretting-corrosion mechanism, as well as the causes of this mechanism and the difference of damage between the interfaces through in vitro and in silico analysis. Four pairs of femoral stems and heads were evaluated, three pairs for in vitro analysis and one pair for 3D reconstruction and in silico analysis. The in vitro analysis, fretting-corrosion testing, and damage analysis, allowed to identify that the stem body was the surface most affected by fretting-corrosion mechanism, with an affected area higher than the trunnion surface. The in silico allows to identify that the micromotion in the stem-cement interface was higher than at the stem-head interface. This high micromotion tends to increase the damage by fretting-corrosion. The results showed that the damage by fretting-corrosion was higher in the stem-cement interface, possibly caused by the higher micromotion in the interface.