Investigating the Role of Rods and Plates in Trabecular Bone Lattices

Description

In this presentation led by Andrew Phillips, the topic focuses on the mechanical properties of trabecular bone, specifically investigating the roles of rods and plates within its microarchitecture. Phillips illustrates that while bone material properties at the macroscale are significantly influenced by its microstructure, experimental relationships such as Young’s modulus (E) are shown to depend on density (rho) expressed through the equation E = alpha * rho^beta, with constants alpha and beta varying based on structural behaviors.



The discussion delves into recent studies highlighting that trabecular bone has lower nodal connectivity than previously thought, prompting the exploration of a Voronoi lattice structure that could mimic this microarchitecture effectively. Through virtual samples created from random points leading to Voronoi structures, various configurations with differing rod and plate ratios were assessed. Phillips explains their methodology utilizing finite element analysis software to simulate these structures, optimizing for stiffness and revealing that the presence of plates significantly enhances rigidity compared to rod-only structures.



Further, the results demonstrate non-linear increases in Young’s modulus with higher densities and a more linear relationship as the volume occupied by plates increases, suggesting that incorporating such architectural elements in biomechanical applications, like implants, could lead to better material performance. In concluding, he indicates ongoing efforts to create more adaptive materials that can respond to mechanical stimuli, inviting collaboration for future innovations in this field.

DOI: 10.1302/3114-221083

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