Hydration and radiation effects on the residual stress state of cortical bone.

Autor: Tung PK; School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia., Mudie S, Daniels JE
Jazyk: angličtina
Zdroj: Acta biomaterialia [Acta Biomater] 2013 Dec; Vol. 9 (12), pp. 9503-7. Date of Electronic Publication: 2013 Jul 31.
DOI: 10.1016/j.actbio.2013.07.028
Abstrakt: The change in the biaxial residual stress state of hydroxyapatite crystals and collagen fibrillar structure in sections of bovine cortical bone has been investigated as a function of dehydration and radiation dose using combined small- and wide-angle X-ray scattering. It is shown that dehydration of the bone has a pronounced effect on the residual stress state of the crystalline phase, while the impact of radiation damage alone is less dramatic. In the initial hydrated state, a biaxial compressive stress of approximately -150 MPa along the bone axis exists in the hydroxyapatite crystals. As water evaporates from the bone material, the stress state moves to a tensile state of approximately 100 MPa. The collagen fibrillar structure is initially in a tensile residual stress state when the bone is hydrated and the state increases in magnitude slightly with dehydration. Radiation dose in continually hydrated samples also reduces the initial biaxial compressive stress magnitude in the hydroxyapatite phase; however, the stress remains compressive. Radiation exposure alone does not appear to affect the stress state of the collagen fibrillar structure.
(Copyright © 2013 Acta Materialia Inc. All rights reserved.)
Databáze: MEDLINE
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