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Numerical analysis of the mechanical response of novel swelling bone implants in polyurethane foams
Journal article   Peer reviewed

Numerical analysis of the mechanical response of novel swelling bone implants in polyurethane foams

Amirreza Sadighi, Moein Taghvaei, Mehrangiz Taheri, Delaney Oeth, Sorin Siegler, Thomas P. Schaer and Ahmad R. Najafi
Journal of the mechanical behavior of biomedical materials, v 143, 105871
Jul 2023
DOI: https://doi.org/10.1016/j.jmbbm.2023.105871
PMID: 37187154
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Bone implants Expansion-fit mechanism Finite element method Pull-out test Self-anchoring Swelling
In this study, a numerical framework was developed in order to analyze the swelling properties, mechanical response and fixation strength of swelling bone anchors. Using this framework, fully porous and solid implants, along with a novel hybrid design (consisting of a solid core and a porous sleeve), were modeled and studied. Free swelling experiments were conducted to investigate their swelling characteristics. The finite element model of swelling was validated using the conducted free swelling. Compared with the experimental data, results obtained from the finite element analysis proved the reliability of this frame-work. Afterwards, the swelling bone anchors were studied embedded in artificial bones with different densities with two different interface properties: considering frictional interface between the bone anchors and artificial bones (simulating the stages prior to osteointegration, when the bone and implant are not fully bonded and the surface of the implant can slide along the interface), and perfectly bonded (simulating the stages subsequent to osteointegration, when the bone and implant are fully bonded). It was observed that the swelling considerably decreases while the average radial stress on the lateral surface of the swelling bone anchor surges in the denser artificial bones. Ultimately, the pull-out experiments and simulations of the swelling bone anchors from the artificial bones were conducted to look into the fixation strength of the swelling bone anchors. It was found that the hybrid swelling bone anchor exhibits mechanical and swelling properties close to those of solid bone anchors, while also bone in-growth is expected to happen, which is an integral factor to these bone anchors. • A numerical investigation is conducted into swelling co-polymeric implants. • Three designs for the swelling implants are considered: solid, porous, and hybrid. • Radial displacements and stresses of the implants are considered and compared. • Hybrid design shows the most favorable mechanical response and swelling properties.•Pull-out experiments and simulations are done to look into their fixation strength.

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5 citations in Web of Science
6 citations in Scopus

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UN Sustainable Development Goals (SDGs)

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#5 Gender Equality

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Collaboration types
Domestic collaboration
Web of Science research areas
Engineering, Biomedical
Materials Science, Biomaterials
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