Finite Element Analysis of Vertebral Body Mechanics With A Nonlinear Microstructural Model for The Trabecular Core  

Oleh:

Langrana, N. A. ; Cuitino, A. M. ; Overaker, D.W.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Biomechanical Engineering vol. 121 no. 5 (1999), page 542-550.
Topik: finite element; finite element; analysis; vertebral body; mechanics; non linear; microstructural; trabecular core

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ52.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In this study, a finite element model of a vertebral body was used to study the load - bearing role of the two components (shell and core) under compression. The model of the vertebral body has the characteristic kidney shape transverse cross section with concave lateral surfaces and flat superior and inferior surfaces. A non linear unit cell based foam model was used for the trabecular core, where non linearity was introduced as coupled elastoplastic beam behaviour of individual trabeculae. The advantage of the foam model is that architecture and material properties are separated, thus facilitating studies of the effects of architecture on the apparent behavior. Age - related changes in the trabecular architecture were considered in order to address the effects of osteoporosis on the load - sharing behaviour. Stiffness changes with age (architecture and porosity changes) for the trabecular bone model were shown to follow trends in published experimental results. Elastic analyses showed that the relative contribution of the shell to the load - bearing ability of the vertebra decreases with increasing age and lateral wall curvature. Elasto - plastic (non linear) analyses showed that failure regions were concentrated in the upper posterior region of the vertebra in both the shell and core components. The ultimate load of the vertebral body model varied from 2800 N to 5600 N, depending on age (architecture and porosity of the trabecular core) and shell thickness. The model predictions lie within the range of experimental results. The results provide an understanding of the relative role of the core and shell in vertebral body mechanics and shed light on the yield and post - yield behaviour of the vertebral body.

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