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. 2022 Feb 1;12(1):75-82.
doi: 10.31661/jbpe.v0i0.2005-1116. eCollection 2022 Feb.

Numerical Evaluation of a Porous Tibial-Knee Implant using Gyroid Structure

Basma Eltlhawy  1 , Noha Fouda  2 , Ibrahim Eldesouky  2
Affiliations

Numerical Evaluation of a Porous Tibial-Knee Implant using Gyroid Structure

Basma Eltlhawy et al. J Biomed Phys Eng. .

Abstract

Background: Porous materials are recommended for orthopedic applications as they eliminate issues of interfacial instability with tissues and reduce mechanical mismatch of the young's modulus.

Objective: The current research provides a finite element analysis (FEA) to investigate porous gyroid Ti6Al4V structure compared to a solid stem model for human tibial-knee implantation of total knee replacement (TKR).

Material and methods: In this study, the implant proximal portion was designed as porous gyroid Ti6Al4V structure with 500 µm pore size. CATIA V5R18 was used for modeling both gyroid and full solid models. Structural analysis was carried out using ANSYS R18.1 to evaluate the implant performance.

Results: After gyroid implantation, the maximum von-Mises stress obtained under the tibial tray was increased to 10.081 MPa. Also, the maximum shear stress at the stem/bone interface was reduced to 0.7347 MPa. The stress concentration at the stem tip and the bone strain energy were also improved. The minimum factor of safety is 4.6 for the gyroid porous implant. A proof of concept model was additively manufactured successfully with pore size 577.7733 ± 34.762 µm.

Conclusion: The results indicated enhanced clinical performance of the porous tibial-knee implant compared to the solid titanium implant via increasing the maximum von-Mises bone stresses and decreasing the maximum shear stress at the bone/implant interface.

Keywords: Knee Prosthesis; Porous; Shear Stress; Titanium Alloy (Ti6Al4V); Total Knee Replacement; Von-Mises Stress.

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Figures

Figure 1
Figure 1
(a) Prepared bone to insert artificial implant; (b) Geometry of full solid tibia Implant; (c) Gyroid stem implant.
Figure 2
Figure 2
(a) Loading conditions applied to model; (b) 3D Mesh of bone-implant assembly.
Figure 3
Figure 3
Stress distribution developed in upper surface of bone under the tibial tray for both solid and porous.
Figure 4
Figure 4
Stress distribution developed in bone/implant interface for both solid and porous cases.
Figure 5
Figure 5
Stress distribution developed in bone under the stem tip for both solid and porous.
Figure 6
Figure 6
Strain energy distribution developed in the bone for solid and porous.
Figure 7
Figure 7
(a) Proof of concept gyroid implant, (b) Scanning Electron Microscope (SEM) image of the pore size.
See this image and copyright information in PMC

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