Journal
JOURNAL OF BIOMECHANICS
Volume 42, Issue 16, Pages 2826-2829Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2009.08.017
Keywords
Biomedical material cutting; Machinability; Secondary osteon; Fracture analysis
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Funding
- Japan Society for the Promotion of Science (JSPS) [20760081]
- Grants-in-Aid for Scientific Research [20760081] Funding Source: KAKEN
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Until date, many devices have been developed for cutting human bones during orthopedic surgeries. However, bones are anisotropic material, and their machining characteristics depend on the tool feed direction. In this study, microcutting of the bovine cortical bone is performed and its structure observed under a microscope. Furthermore, the formation of cutting chips and measurement of the cutting force during bone machining are dynamically observed while considering the anisotropy of bone tissue. In particular, the fracture of secondary osteons and crack propagation in bones are observed and analyzed. The results indicate that when the cut depth exceeds 20 mu m and is greater than the interval of concentric lamellae, cracks are formed together with chips. A new method for bone machining is proposed. This method is based on the characteristics of crack propagation in bones and is expected to produce low mechanical stress and realize highly efficient and precise machining of living tissues such as bones. (C) 2009 Elsevier Ltd. All rights reserved.
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