Abstract
Purpose: Detailed morphologic analysis of particles produced during wear of orthopedic implants is important in determining a correlation among material, wear, and biological effects. However, the use of simple shape descriptors is insufficient to categorize the data and to compare the nature of wear particles generated by different implants. An approach based on Discrete Fourier Transform (DFT) is presented for describing particle shape and surface texture. Method: Four metal-on-metal bearing couples were tested in an orbital wear simulator under standard and adverse (steep-angled cups) wear simulator conditions. Digitized Scanning Electron Microscope (SEM) images of the wear particles were imported into MATLAB to carry out Fourier descriptor calculations via a specifically developed algorithm. The descriptors were then used for studying particle characteristics (shape and texture) as well as for cluster classification. Results and Conclusions: Analysis of the particles demonstrated the validity of the proposed model by showing that steep-angle Co-Cr wear particles were more asymmetric, compressed, extended, triangular, square, and roughened at 3 Mc than after 0.25 Mc. In contrast, particles from standard angle samples were only more compressed and extended after 3 Mc compared to 0.25 Mc. Cluster analysis revealed that the 0.25 Mc steep-angle particle distribution was a subset of the 3 Mc distribution.
J Appl Biomater Funct Mater 2012; 10(2): 141 - 148
Article Type: ORIGINAL RESEARCH ARTICLE
DOI:10.5301/JABFM.2012.9680
Authors
Dongning Zhang, Janet R. Page, Aaron E. Kavanaugh, Fabrizio Billi
Article History
- • Accepted on 25/02/2012
- • Available online on 19/09/2012
- • Published online on 27/09/2012
This article is available as full text PDF.
Authors
- Zhang, Dongning
[PubMed]
[Google Scholar]
The J. Vernon Luck, Sr., M.D. Orthopedic Research Center Los Angeles Orthopedic Hospital, Los Angeles - USA
- Page, Janet R.
[PubMed]
[Google Scholar]
The J. Vernon Luck, Sr., M.D. Orthopedic Research Center Los Angeles Orthopedic Hospital, Los Angeles - USA
- Kavanaugh, Aaron E.
[PubMed]
[Google Scholar]
The J. Vernon Luck, Sr., M.D. Orthopedic Research Center Los Angeles Orthopedic Hospital, Los Angeles - USA
- Billi, Fabrizio
[PubMed]
[Google Scholar]
The J. Vernon Luck, Sr., M.D. Orthopedic Research Center Los Angeles Orthopedic Hospital, Los Angeles - USA
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