Bone Damage Evolution Around Integrated Metal Screws Using X-Ray Tomography - in situ Pullout and Digital Volume Correlation.

ABSTRACT: Better understanding of the local deformation of the bone network around metallic implants subjected to loading is of importance to assess the mechanical resistance of the bone-implant interface and limit implant failure. In this study, four titanium screws were osseointegrated into rat tibiae for 4 weeks and screw pullout was conducted in situ under x-ray microtomography, recording macroscopic mechanical behavior and full tomographies at multiple load steps before failure. Images were analyzed using Digital Volume Correlation (DVC) to access internal displacement and deformation fields during loading. A repeatable failure pattern was observed, where a ∼300-500 μm-thick envelope of bone detached from the trabecular structure. Fracture initiated close to the screw tip and propagated

SUBMITTER: Le Cann S 

PROVIDER: S-EPMC7419699 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature