Modeling Micromotion: Micro-FE Analysis of Bone-Screw Interactions¶
Benjamin Schnabel (HLRS)
Abstract¶
Bone fracture healing is sensitive to implant stability: while small micromotions (< 20 µm) are tolerated, larger motions (40 µm - 150 µm) generate tensile and shear stresses that encourage fibrous membrane formation around implants. Persistent fibrous tissue, driven by macrophage-mediated bone resorption, undermines osseointegration and can lead to prosthesis loosening and failure. This presentation therefore aims to develop a micro-FE model of bone-screw interactions during the tightening phase to investigate how tightening-induced micromotion affects peri-implant bone mechanics and maybe predict the long-term stability.