The fracture toughness of cancellous bone

Cook, R. B.; Zioupos, P.

Abstract

The mechanical capacity and integrity of cancellous bone is crucial in osteoporosis, a condition which is set to become more prevalent with increasing lifespan and population sizes. The fracture toughness (FT) of cancellous bone has never been examined before and the conditions associated with the growth of a major crack through the lattice of cancellous bone, a cellular solid, may improve our understanding for structural integrity of this material. The aim of this study is to provide (i) basic data on cancellous bone FT and (ii) the experimental support for the hypothesis of Gibson, L.J., Ashby, M.F. [1997a. Chapter 10: Wood. In: Cellular Solids: Structure and Properties, second ed. Cambridge University Press, pp. 387-428; Gibson, L.J., Ashby, M.F., 1997b. Chapter 11: Cancellous Bone. In: Cellular Solids: Structure and Properties, second ed. Cambridge University Press, pp. 429-52] that the FT of cancellous bone tissue is governed by the density of the tissue to a power function of between one and two. 294 SENB and 121 DC(T) specimen were manufactured from 45 human femoral heads, 37 osteoporotic and 8 osteoarthritic, as well as 19 equine thoracic vertebrae. The samples were manufactured in two groups: the first aligned with the trabecular structure (A∥), the second orientated at 90° to the main trabecular orientation (A⊥). The samples were tested in either tensile or bending mode to provide values of the stress intensity factor (K). The results which were obtained show a strong and significant link between the density of the cancellous bone tissue and that the critical stress intensity values are governed by the density of the tissue to a power function of between 1 and 2 (KQ vs. apparent density: A⊥=1.58, A∥=1.6). Our results provide some fundamental values for the critical stress intensity factor for cancellous bone and also support the previous hypothesis as set by Gibson, L.J., Ashby, M.F., 1997a. Chapter 10: Wood. In: Cellular Solids: Structure and Properties, second ed. Cambridge University Press, pp. 387-428; Gibson, L.J., Ashby, M.F., (1997b). Chapter 11: Cancellous Bone. In: Cellular Solids: Structure and Properties, second ed. Cambridge University Press, pp. 429-52. © 2009 Elsevier Ltd. All rights reserved.

Citation

Cook, R. B., & Zioupos, P. (2009). The fracture toughness of cancellous bone. Journal of biomechanics, 42(13), 2054-2060. https://doi.org/10.1016/j.jbiomech.2009.06.001

• Journal Article Type: Article
• Acceptance Date: Jun 2, 2009
• Publication Date: Sep 18, 2009
• Deposit Date: Oct 24, 2023
• Journal: Journal of Biomechanics
• Print ISSN: 0021-9290
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 42
• Issue: 13
• Pages: 2054-2060
• DOI: https://doi.org/10.1016/j.jbiomech.2009.06.001
• Public URL: https://hull-repository.worktribe.com/output/4424321
• Additional Information: Corrigendum published 6 March 2010:; The authors regret that the axis title of the y-axes of the graphs in Figs. 4 and 5 of the published paper are shown in units of (MPa m−1/2) instead of the correct (MPa m1/2). The authors would like to apologize for this typographical error and any inconvenience it may have caused.