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Eccentricity Error Correction for Automated Estimation of Polyethylene Wear after Total Hip Arthroplasty

Kerrigan, Stuart and McKenna, S.J. and Ricketts, I.W. and Wigderowitz, C.A. (2005) Eccentricity Error Correction for Automated Estimation of Polyethylene Wear after Total Hip Arthroplasty. In: Proceedings of the 9th Annual Medical Image Understanding and Analysis Conference. The British Machine Vision Association, Durham, pp. 255-258. ISBN 1 901725 28 6

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Abstract

Acetabular wear of total hip replacements can be estimated from radiographs based on the apparent displacement of the femoral head relative to the acetabular cup. A wire marker is often attached to the polyethylene cup rim and its projection can be modelled as an ellipse. The centre of this ellipse is not the projection of the centre of the rim so its use as a reference point to measure wear can be problematic. The implications of the resulting eccentricity errors were investigated. The 3D poses of acetabular cups estimated from projected ellipse parameters were used to estimate error bounds and expected error values. The effect of correcting for these errors on wear measurements was investigated using standard clinical anteroposterior radiographs and an automated ellipse fitting method.

Item Type: Book Section
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Uncontrolled Keywords: eccentricity error, acetabular wear, total hip replacements, wear measurements, clinical anteroposterior radiographs
Subjects: Q Science > QA Mathematics > QA76 Computer software
Divisions: Academic Departments > Worcester Business School
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Depositing User: Stuart Kerrigan
Date Deposited: 06 Jul 2017 09:33
Last Modified: 06 Jul 2017 10:00
URI: https://eprints.worc.ac.uk/id/eprint/5646

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