Journal article
Digital edge-detection measurement of polyethylene wear after total hip arthroplasty
Journal of bone and joint surgery. American volume, Vol.79(5), pp.690-700
American volume
05/01/1997
DOI: 10.2106/00004623-199705000-00008
PMID: 9160941
Abstract
A novel digital edge-detection computer technique was developed to measure polyethylene wear after total hip arthroplasty. The new method objectively infers the margins of the component by evaluating gradients of gray-scale intensity on digitized images of the radiographs. Compared with previous methods for measurement of wear, digital edge detection substantially reduces observer subjectivity. The technique was validated directly by measuring wear artificially produced by spherical-front milling of polyethylene liners in a benchtop series. Under such conditions, digital edge detection proved 6.4 times more accurate and 7.1 times more reproducible than manual measurement with conventional circular templates. In addition, clinical application of the new digital imaging technique was illustrated in a series of forty-three patients in whom a metal-backed acetabular cup had been inserted with cement. A random-coefficients prediction algorithm was invoked to estimate long-term wear (mean late rate of wear for the cohort, 0.087 millimeter per year at a mean of 118 months after the operation) on the basis of measurements of short-term wear (mean early rate of wear for the cohort, 0.154 millimeter per year at a mean of twenty-four months).
Details
- Title: Subtitle
- Digital edge-detection measurement of polyethylene wear after total hip arthroplasty
- Creators
- Scott Shaver - †Zimmer, Incorporated, 727 North Detroit, Warsaw, Indiana 46580.Thomas BrownStephen HillisJohn Callaghan
- Resource Type
- Journal article
- Publication Details
- Journal of bone and joint surgery. American volume, Vol.79(5), pp.690-700
- Edition
- American volume
- Publisher
- Journal of Bone and Joint Surgery AMERICAN VOLUME
- DOI
- 10.2106/00004623-199705000-00008
- PMID
- 9160941
- ISSN
- 0021-9355
- eISSN
- 1535-1386
- Language
- English
- Date published
- 05/01/1997
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Biostatistics; Orthopedics and Rehabilitation; Internal Medicine
- Record Identifier
- 9984318798302771
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