Implicit and explicit ﬁnite element models predict the mechanical response of calcium phosphate-titanium cranial implants

Lewin, Susanne; Fleps, Ingmar; Neuhaus, Dominique; Öhman‐Mägi, Caroline; Ferguson, Stephen J.; Persson, Cecilia; Helgason, Benedikt

doi:10.1016/j.jmbbm.2020.104085

Cited by 7 publications

(1 citation statement)

References 35 publications

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“…One of the potential ways to further improve the fixation between the implant and the bone is to stimulate osseointegration by migration of osteogenic cells to the bone defect [13]. Recently, the positive effect of osseointegration led scientists to study cranial implants partly made from bioactive materials [14,15]. Same authors in the study [7] observed bone formation at bone-implant contact (BIC) interface using bioactive ceramics as a component of cranial implants.…”

Section: Introductionmentioning

confidence: 99%

Beneficial osseointegration effect of hydroxyapatite coating on cranial implant – FEM investigation

Chamrad

Marcián

2021

PLoS ONE

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A firm connection of the bone-implant-fixation system is of utmost importance for patients with cranial defects. In order to improve the connection reliability, the current research focuses on finding the optimal fixation method, as well as selection of the implant manufacturing methods and the used materials. For the latter, implementation of bioactive materials such as hydroxyapatite or other calcium phosphates has also been considered in the literature. The aim of this study was to investigate the effect of gradual osseointegration on the biomechanical performance of cranial Ti6Al4V implants with a deposited HA coating as the osseointegration agent. This effect was assessed by two different computational approaches using finite element method (FEM) modeling. The values of key input parameters necessary for FEM were obtained from experimental plasma spray deposition of HA layers onto Ti6Al4V samples. Immediately upon implantation, the HA layer at the bone-implant contact area brought only a slight decrease in the values of von Mises stress in the implant and the micro-screws when compared to a non-coated counterpart; importantly, this was without any negative trade-off in other important characteristics. The major benefit of the HA coatings was manifested upon the modeled osseointegration: the results of both approaches confirmed a significant reduction of investigated parameters such as the total implant displacements (reduced from 0.050 mm to 0.012 mm and 0.002 mm while using Approach I and II, respectively) and stresses (reduced from 52 MPa to 10 MPa and 1 MPa) in the implanted components in comparison to non-coated variant. This is a very promising result for potential use of thermally sprayed HA coatings for cranial implants.

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Section: Introductionmentioning

confidence: 99%

Beneficial osseointegration effect of hydroxyapatite coating on cranial implant – FEM investigation

Chamrad

Marcián

2021

PLoS ONE

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An Interactive Fluid–Solid Approach for Numerical Modeling of Composite Metal Foam Behavior under Compression

Kaushik,

Rabiei

2024

Adv Eng Mater

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Composite metal foams (CMF) are renowned for their high strength‐to‐density ratio, high stiffness, and energy absorption capabilities. Homogenized finite element models of CMF have been numerically solved to understand the mechanical behavior of the material under a variety of external loading conditions. This work aims to pioneer a comprehensive finite element model for steel–steel composite metal foam by incorporating the interactions between embedded stainless‐steel hollow spheres with entrapped air inside stainless‐steel matrix. The material behavior of hollow spheres, surrounding matrix, and air are modeled using Johnson–Cook (JC) plasticity, Deshpande–Fleck (D–F) foam, and linear polynomial equation of state in LS DYNA. Further, the finite element model utilizes a combination of Lagrangian solid elements and meshfree smooth particles hydrodynamics with appropriate contacts to effectively model the interaction of entrapped air within stainless‐steel hollow spheres with surrounding metallic spheres and matrix. The strain rate and the crosshead velocity of 65 s−1 and 2.4765 m s−1 are used for quasistatic compression analysis. Finally, the results obtained from the computational model are compared and validated using previously reported experimental quasistatic compression data. The numerical model corroborates stress–strain response of CMF with 5.6% error for plateau stresses average within 25% and 30% strain.

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Is the 0.2%-Strain-Offset Approach Appropriate for Calculating the Yield Stress of Cortical Bone?

et al. 2021

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Implicit and explicit ﬁnite element models predict the mechanical response of calcium phosphate-titanium cranial implants

Cited by 7 publications

References 35 publications

Beneficial osseointegration effect of hydroxyapatite coating on cranial implant – FEM investigation

Beneficial osseointegration effect of hydroxyapatite coating on cranial implant – FEM investigation

An Interactive Fluid–Solid Approach for Numerical Modeling of Composite Metal Foam Behavior under Compression

Is the 0.2%-Strain-Offset Approach Appropriate for Calculating the Yield Stress of Cortical Bone?

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