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Journal of Biomedical Optics

Fluorescence spectroscopic analysis of surface and subsurface residual stress fields in alumina hip joints
Author(s): Giuseppe Pezzotti; Toshiyuki Tateiwa; Wenliang Zhu; Tsuyoshi Kumakura; Kiyotaka Yamada; Kengo Yamamoto
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Paper Abstract

We aim to establish a confocal spectroscopic technique able to study the features of fluorescence spectra arising from native Cr3+ impurity in polycrystalline alumina (Al2O3as a biomaterial and to use their emission lines as microscopic probes for the characterization of residual stress fields stored in artificial hip prostheses during their implantation in vivo. As an application of the technique, we report for the first time concerning the evolution of microscopic (residual) stress fields stored on the surface and in the subsurface of N=7 retrieved Al2O3 hip joints after exposure in the human body from a few months to 19 yr. The micrometric diameter of the laser beam waist impinging on the joint surface (typically about 1 µm in lateral resolution) enables us to estimate the patterns and magnitude of residual stress with high spatial resolution, at least comparable with the grain size of the material. In addition, a selected confocal configuration for the optical probe enables minimization of the probe size along the in-depth direction. According to a statistical collection of data on the microscopic level for retrieved femoral heads in toto, a residual stress field arising from loading history in vivo during the lifetime of the Al2O3 femoral head can be revealed. Finally, an interpretation is given of microscopic wear mechanisms in Al2O3 artificial hip joints consistent with the observed evolution of surface residual stress fields on elapsed time in vivo.

Paper Details

Date Published: 1 March 2006
PDF: 10 pages
J. Biomed. Opt. 11(2) 024009 doi: 10.1117/1.2193470
Published in: Journal of Biomedical Optics Volume 11, Issue 2
Show Author Affiliations
Giuseppe Pezzotti, Kyoto Institute of Technology (Japan)
Toshiyuki Tateiwa, Kyoto Institute of Technology (Japan)
Wenliang Zhu, Kyoto Institute of Technology (Japan)
Tsuyoshi Kumakura, Kyoto Institute of Technology (Japan)
Kiyotaka Yamada
Kengo Yamamoto, Kyoto Institute of Technology (Japan)

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