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Published on: April 14, 2023
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Topological design and biomechanical evaluation for 3D printed multi-segment artificial vertebral implants
Jianfeng Kang1, Enchun Dong2, Xiangdong Li3
1Jihua Laboratory, Foshan, Guangdong, China; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaan Xi, China.
Summary
This study developed a new method for designing 3D printed artificial vertebral implants (AVIs) for multi-segment spinal reconstruction. The optimized AVIs demonstrate superior strength, stability, and lightweight properties, meeting clinical safety requirements.
Area of Science:
- Biomedical Engineering
- Materials Science
- Orthopedic Surgery
Background:
- Customized spinal implants from additive manufacturing are increasingly used.
- Design methodologies for multi-segment vertebral reconstruction remain unclear.
Purpose of the Study:
- To develop a multi-objective optimization method for designing artificial vertebral implants (AVIs).
- To create AVIs that are lightweight, high-strength, and high-stability for multi-segment spinal reconstruction.
- To evaluate the biomechanical performance of novel AVIs.
Main Methods:
- Finite element analysis (FEA) to assess biomechanical performance under various loads.
- Selective laser melting (SLM) for manufacturing 3D printed titanium AVIs.
- Compressive testing to evaluate mechanical properties and compare with trussed designs.
Main Results:
- Optimized AVIs exhibited significantly lower maximum Mises stress (41.5% of trussed implants) and remained below fatigue strength limits.
- Optimized implants showed double the maximum compression load and stiffness per unit mass compared to trussed designs.
- The optimized implants met safety requirements for spinal reconstruction.
Conclusions:
- The novel optimization methodology effectively designs 3D printed multi-segment artificial vertebral implants.
- The developed AVIs offer improved biomechanical performance, including lightweight, high-strength, and high-stability characteristics.
- Clinical application of the optimized implants yielded positive short-term outcomes, validating the design approach.
