Accuracy of radiographic and radiostereometric wear measurement of different hip prostheses: an experimental study.
(2004) In Acta Orthopaedica Scandinavica 75(6). p.691-700- Abstract
- Background In vivo measurement of wear in the ball and socket articulation of total hip arthroplasties is of interest in the evaluation of both existing and new implants. Controversy reigns regarding the accuracy of different radiological measurement techniques and in particular how accuracy has been assessed.
Material and methods We assessed the accuracy of 2 radiostereometric (RSA) techniques for wear measurement and 3 standard radiographic techniques, namely Imagika (image analyzing software), Imagika corrected for head center displacement, and the Charnley Duo method. 5 custom-made adjustable phantoms with different prosthetic components were used.
Results In 20 measurements of all 5 phantoms at 3... (More) - Background In vivo measurement of wear in the ball and socket articulation of total hip arthroplasties is of interest in the evaluation of both existing and new implants. Controversy reigns regarding the accuracy of different radiological measurement techniques and in particular how accuracy has been assessed.
Material and methods We assessed the accuracy of 2 radiostereometric (RSA) techniques for wear measurement and 3 standard radiographic techniques, namely Imagika (image analyzing software), Imagika corrected for head center displacement, and the Charnley Duo method. 5 custom-made adjustable phantoms with different prosthetic components were used.
Results In 20 measurements of all 5 phantoms at 3 levels of simulated wear (0.2 mm, 1.0 mm and 1.5 mm), the mean measurement error of the digital RSA examinations was 0.010 mm (accuracy 0.42). The corresponding error values for the three radiographic techniques were 0.19 (accuracy 1.3) for Charnley Duo, 0.13 (accuracy 1.3) for Imagika corrected, and 1.021 (accuracy 2.99) for Imagika. Measurement error decreased from 0.011 mm with ordinary RSA to 0.004 with RSA digital measurement. Head size, direction of wear in relation to the cup or type of prosthetic component did not influence the measurement error. The results of Charnley Duo and Imagika corrected were similar but the latter had an inexplicable systematic error in measuring one of the phantoms. Imagika had the worst results due to its inability to compensate for the out-of-head center effect. Alumina heads were difficult to analyze with all methods.
Interpretation By using the ISO standard for assessing accuracy, RSA can be expected to measure wear with an accuracy of about 0.4 mm irrespective of prosthetic component studied or direction of wear, whereas the best technique, in our study, based on standard radiographs can be accurate to about 1.3 mm. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/135022
- author
- von Schewelov, Thord LU ; Sanzén, Lennart ; Börlin, Niclas ; Markusson, Patrik LU and Önsten, Ingemar LU
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Imaging, Prosthesis Failure, Hip Prosthesis, Phantoms, Comparative Study, Hip, Replacement, Arthroplasty
- in
- Acta Orthopaedica Scandinavica
- volume
- 75
- issue
- 6
- pages
- 691 - 700
- publisher
- Taylor & Francis
- external identifiers
-
- wos:000226050700006
- pmid:15762258
- scopus:10944233565
- ISSN
- 0001-6470
- DOI
- 10.1080/00016470410004058
- language
- English
- LU publication?
- yes
- id
- abf9089b-f1a5-4b91-bb39-2f544ae84546 (old id 135022)
- alternative location
- http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=15762258&dopt=AbstractPlus
- date added to LUP
- 2016-04-01 17:04:50
- date last changed
- 2022-01-29 00:12:00
@article{abf9089b-f1a5-4b91-bb39-2f544ae84546,
abstract = {{Background In vivo measurement of wear in the ball and socket articulation of total hip arthroplasties is of interest in the evaluation of both existing and new implants. Controversy reigns regarding the accuracy of different radiological measurement techniques and in particular how accuracy has been assessed.<br/><br>
<br/><br>
Material and methods We assessed the accuracy of 2 radiostereometric (RSA) techniques for wear measurement and 3 standard radiographic techniques, namely Imagika (image analyzing software), Imagika corrected for head center displacement, and the Charnley Duo method. 5 custom-made adjustable phantoms with different prosthetic components were used.<br/><br>
<br/><br>
Results In 20 measurements of all 5 phantoms at 3 levels of simulated wear (0.2 mm, 1.0 mm and 1.5 mm), the mean measurement error of the digital RSA examinations was 0.010 mm (accuracy 0.42). The corresponding error values for the three radiographic techniques were 0.19 (accuracy 1.3) for Charnley Duo, 0.13 (accuracy 1.3) for Imagika corrected, and 1.021 (accuracy 2.99) for Imagika. Measurement error decreased from 0.011 mm with ordinary RSA to 0.004 with RSA digital measurement. Head size, direction of wear in relation to the cup or type of prosthetic component did not influence the measurement error. The results of Charnley Duo and Imagika corrected were similar but the latter had an inexplicable systematic error in measuring one of the phantoms. Imagika had the worst results due to its inability to compensate for the out-of-head center effect. Alumina heads were difficult to analyze with all methods.<br/><br>
<br/><br>
Interpretation By using the ISO standard for assessing accuracy, RSA can be expected to measure wear with an accuracy of about 0.4 mm irrespective of prosthetic component studied or direction of wear, whereas the best technique, in our study, based on standard radiographs can be accurate to about 1.3 mm.}},
author = {{von Schewelov, Thord and Sanzén, Lennart and Börlin, Niclas and Markusson, Patrik and Önsten, Ingemar}},
issn = {{0001-6470}},
keywords = {{Imaging; Prosthesis Failure; Hip Prosthesis; Phantoms; Comparative Study; Hip; Replacement; Arthroplasty}},
language = {{eng}},
number = {{6}},
pages = {{691--700}},
publisher = {{Taylor & Francis}},
series = {{Acta Orthopaedica Scandinavica}},
title = {{Accuracy of radiographic and radiostereometric wear measurement of different hip prostheses: an experimental study.}},
url = {{https://lup.lub.lu.se/search/files/4868654/624523.pdf}},
doi = {{10.1080/00016470410004058}},
volume = {{75}},
year = {{2004}},
}