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Validation of an optical system to measure acetabular shell deformation in cadavers

Lookup NU author(s): Dr Martin Bone, Professor Tom Joyce, Professor David Deehan, James Holland


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Deformation of the acetabular shell at the time of surgery can result in poor performance and early failure of the hip replacement. The study aim was to validate an ATOS III Triple Scan optical measurement system against a co-ordinate measuring machine using in vitro testing and to check repeatability under cadaver laboratory conditions. Two sizes of custom-made acetabular shells were deformed using a uniaxial/two-point loading frame and measured at different loads. Roundness measurements were performed using both the ATOS III Triple Scan optical system and a co-ordinate measuring machine and then compared. The repeatability was also tested by measuring shells pre- and post-insertion in a cadaver laboratory multiple times. The in vitro comparison with the co-ordinate measuring machine demonstrated a maximum difference of 5 mu m at the rim and 9 mu m at the measurement closest to the pole of the shell. Maximum repeatability was below 1 mu m for the co-ordinate measuring machine and 3 mu m for the ATOS III Triple Scan optical system. Repeatability was comparable between the pre-insertion (below 2 mu m) and post-insertion (below 3 mu m) measurements in the cadaver laboratory. This study supports the view that the ATOS III Triple Scan optical system fulfils the necessary requirements to accurately measure shell deformation in cadavers.

Publication metadata

Author(s): Dold P, Bone MC, Flohr M, Preuss R, Joyce TJ, Deehan D, Holland J

Publication type: Article

Publication status: Published

Journal: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine

Year: 2014

Volume: 228

Issue: 8

Pages: 781-786

Print publication date: 01/08/2014

Online publication date: 01/08/2014

Acceptance date: 07/07/2014

ISSN (print): 0954-4119

ISSN (electronic): 2041-3033

Publisher: Sage


DOI: 10.1177/0954411914546562


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