[Zurück]

T. Gross, D. H. Pahr:
"Influence of Mesh Size and Element Type on Apparent Yield Properties of microCT Based Finite Element Models of Human Trabecular Bone";
Vortrag: VIPimage 2013, Funchal; 14.10.2013 - 16.10.2013; in: "Computational Vision and Medical Image Processing VIPimage 2013", J.M. Tavares, R.M. Natal Jorge (Hrg.); CRC Press/Balkema, Leiden (2013), ISBN: 978-1-138-00081-0; S. 415 - 417.

Mechanical competence of cancellous bone can be investigated by means of the finite element (FE) method. Different meshing techniques were compared by analyzing µCT based nonlinear FE models of 4 trabecular bone structures (BV/TV range: 5-35%). µFE models with 24 µm isotropic hexahedral (hex) elements were generated by direct voxel conversion while linear tetrahedral (tet) and quadratic tetrahedral (tet2) models were generated with different element sizes (range: 20-100 µm) using a volume conserving meshing algorithm (Simpleware Ltd). The different models were analyzed under compression until apparent level yielding. For tet2 models, apparent stiffness and yield properties did not change with varying element size. Compared to quadratic tet2 models, linear tet models showed an overest imation of 10-20% while hexahedral (hex) µFE models showed only slight deviations. Tue study concludes that apparent yield properties of trabecular bone structures can be accurately modeled using coarse quadratic tetrahedral finite element models.