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Assessment of non-contacting optical methods to measure wear and surface roughness in ceramic total disc replacements

Green, Naomi C.; Bowen, James; Hukins, David W. L. and Shepherd, Duncan E. T. (2015). Assessment of non-contacting optical methods to measure wear and surface roughness in ceramic total disc replacements. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 229(3) pp. 245–254.

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This study presents a method for measuring the low volumetric wear expected in ceramic total disc replacements, which can be used to replace intervertebral discs in the spine, using non-contacting optical methods. Alumina-on-alumina ball-on-disc tests were conducted with test conditions approximating those of cervical (neck region of the spine) total disc replacement wear tests. The samples were then scanned using a three-dimensional non-contacting optical profilometer and the data used to measure surface roughness and develop a method for measuring the wear volume. The results showed that the magnification of the optical lens affected the accuracy of both the surface roughness and wear volume measurements. The method was able to successfully measure wear volumes of 0.0001mm3, which corresponds to a mass of 0.0001 mg, which would have been undetectable using the gravimetric method. A further advantage of this method is that with one scan the user can measure changes in surface topography, volumetric wear and the location of the wear on the implant surface. This method could also be applied to more severe wear, other types of orthopaedic implants and different materials.

Item Type: Journal Item
Copyright Holders: 2015 IMechE
ISSN: 2041-3033
Keywords: alumina; ceramic; implants; interferometer; total disc replacement; wear
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 43148
Depositing User: James Bowen
Date Deposited: 28 May 2015 09:01
Last Modified: 09 Dec 2018 18:44
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