Mechanical and biological behaviour of additive manufactured biomimetic biodegradable orthopaedic cortical screws
ISSN: 1355-2546
Article publication date: 19 April 2022
Issue publication date: 14 October 2022
Abstract
Purpose
The complications caused by metallic orthopaedic bone screws like stress-shielding effect, screw loosening, screw migration, higher density difference, painful reoperation and revision surgery for screw extraction can be overcome with the bioabsorbable bone screws. This study aims to use additive manufacturing (AM) technology to fabricate orthopaedic biodegradable cortical screws to reduce the bone-screw-related-complications.
Design/methodology/approach
The fused filament fabrication technology (FFFT)-based AM technique is used to fabricate orthopaedic cortical screws. The influence of various process parameters like infill pattern, infill percentage, layer height, wall thickness and different biological solutions were observed on the compressive strength and degradation behaviour of cortical screws.
Findings
The porous lattice structures in cortical screws using the rapid prototyping technique were found to be better as porous screws can enhance bone growth and accelerate the osseointegration process with sufficient mechanical strength. The compressive strength and degradation rate of the screw is highly dependent on process parameters used during the fabrication of the screw. The compressive strength of screw is inversely proportional to the degradation rate of the cortical screw.
Research limitations/implications
The present study is focused on cortical screws. Further different orthopaedic screws can be modified with the use of different rapid prototyping techniques.
Originality/value
The use of rapid prototyping techniques for patient-specific bone screw designs is scantly reported. This study uses FFFT-based AM technique to fabricate various infill patterns and porosity of cortical screws to enhance the design of orthopaedic cortical screws.
Keywords
Acknowledgements
The authors are thankful to Mr Prabhat Bailey, Lab Technician, Bioprocess Lab, Department of biotechnology, TIET, Patiala, India, for his valuable suggestions and guidance for preparing the biological solutions.
Funding: The present work is financially supported by TIET SEED money grant TU/DORSP/57/7254.
Citation
Agarwal, R., Gupta, V. and Singh, J. (2022), "Mechanical and biological behaviour of additive manufactured biomimetic biodegradable orthopaedic cortical screws", Rapid Prototyping Journal, Vol. 28 No. 9, pp. 1690-1705. https://doi.org/10.1108/RPJ-01-2022-0006
Publisher
:Emerald Publishing Limited
Copyright © 2022, Emerald Publishing Limited