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Design for Additive Manufacturing and Finite Element Analysis of Fe-Mn Biodegradable Fracture Fixation Plate with Varying Porosity Levels

Shaikh, Mustafiz; Kahwash, Fadi; Lu, Zhilun; Alkhreisat, Mohammad; Shyha, Islam

Authors

Mustafiz Shaikh

Zhilun Lu

Mohammad Alkhreisat



Abstract

Fracture fixation plates are osteosynthesis implants used to fix fractured bones in a human body. They are either left in the body or required to be removed after a bone healing period of 3–6 months. Recent trends focus on developing iron (Fe) based porous biodegradable implants eliminating the need for revision surgery. However, Fe alloys in their porous state are prone to a higher rate of corrosion resulting in detrimental mechanical properties. This study proposes a design strategy to develop fracture fixation implants mimicking natural cortical bone, i.e., targeting to possess enough structural strength with a minimal level of porosity. Three fixation plates each with 5, 10, and 15% porosity are developed having a gyroid lattice structure of Triply Periodic Minimal Surface designs. Four-point bending simulation is performed on Ansys to characterize the mechanical properties of the designed implants. Results show a decreasing trend of bending strength and flexural stiffness with higher porosity, but still relevant for fixation of fractured sites at different regions. The bending properties of developed implants are compared with USFDA’s proposed performance criteria, which shows 5% porous implants capable of all load-bearing extremities, whereas implants having 10 and 15% porosity are deemed to be suitable for tibia and humerus fixation.

Presentation Conference Type Conference Paper (Published)
Conference Name International Conference on Additive Manufacturing in Products and Applications 2023
Start Date Sep 12, 2023
End Date Sep 14, 2023
Acceptance Date Sep 1, 2023
Online Publication Date Sep 12, 2023
Publication Date 2024
Deposit Date Jan 19, 2024
Publicly Available Date Sep 13, 2024
Publisher Springer
Pages 239-254
Series Title Springer Tracts in Additive Manufacturing
Series ISSN 2730-9576
Book Title Industrializing Additive Manufacturing: Proceedings of AMPA2023
ISBN 9783031429828, 9783031429859
DOI https://doi.org/10.1007/978-3-031-42983-5_17
Keywords Fracture fixation plate, Design for additive manufacturing, Four-point bending test simulation, Metal additive manufacturing, Triply periodic minimal surface design, Porous implant
Public URL http://researchrepository.napier.ac.uk/Output/3487441
Related Public URLs https://ampa.ethz.ch/