Detailed three-dimensional size and shape characterisation of UHMWPE wear debris
Date
2011
Authors
Gladkis, Laura
Timmers, Heiko
Scarvell, Jennie
Smith, Paul
Journal Title
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Publisher
Elsevier
Abstract
Atomic force microscopy (AFM) is used to characterise UHMWPE wear debris from a knee prosthesis actuated under constant load. The size and shape of debris particles is quantified in all three spatial dimensions. Artificially limiting the analysis to the two-dimensional projections of the particles onto the substrate plane, it has been found that equivalent shape ratio (ESR) plotted as a function of equivalent circle diameter (ECD) follows a trend observed before. Inclusion of the third, vertical spatial dimension of particle height shows that such two-dimensional analysis, as it is often based on SEM images, can greatly misrepresent the actual particle shape. The three-dimensional AFM information indicates that for the prosthesis and the conditions studied here debris particles tend to be deformed independent of their volumetric size. Fractionation of debris particles according to size was achieved with a new filtration protocol. It is demonstrated that with this protocol debris particles settle uniformly across the filter and that particle abundance as function of size can thus reliable be established.
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Keywords
Keywords: Abundance distribution; Atomic force; Knee prosthesis; Particle fractionation; UHMW-PE; Wear debris; Atomic force microscopy; Debris; Three dimensional; Two dimensional; Joint prostheses Abundance distribution; Atomic force microscopy; Knee prosthesis; Particle fractionation; UHMWPE; Wear debris
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Source
WEAR
Type
Journal article
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2037-12-31
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