MSE Research Project Database

Lattice structures for orthopaedic implant applications


Project Leader: Peter Vee Sin Lee
Collaborators: Prof. Yi Min Xie (RMIT)
Primary Contact: Peter Vee Sin Lee (pvlee@unimelb.edu.au)
Keywords: biomaterials; biomechanics; finite element modelling
Disciplines: Biomedical Engineering
Domains: Convergence of engineering and IT with the life sciences

The development of porous metals to alleviate the effects of stress shielding in bone will help improve the function of metallic biomaterials in orthopaedic applications. A critical step in advancing this technology is to design metallic structures with low rigidity that is comparable with bone tissue, but with good mechanical strength. In this study, porous titanium structures with periodic cell topologies will be designed to achieve tunable mechanical properties. The versatility of the design scheme will be demonstrated by examining lattice designs with different stiffness properties achieved by using Selective Laser Melting (SLM) technology.  Large deformation analysis using digital image correlation (DIC) technique and finite element analysis will be used to investigate strain patterns at micro-trusses. The project will also include lattice structure with functionally-graded stiffness design by varying the diameters of micro-trusses within the structure. A stiffness graded material may be favourable for anatomical site that has strong depth dependent variations, such as in trabecular bone microstructures.