A New Method to Make 2-D Wear Measurements Less Sensitive to Projection Differences of Cemented THAs
(2008) In Clinical Orthopaedics and Related Research 466(3). p.684-690- Abstract
- Wear curves from individual patients often show unexplained irregular wear curves or impossible values (negative wear). We postulated errors of two-dimensional wear measurements are mainly the result of radiographic projection differences. We tested a new method that makes two-dimensional wear measurements less sensitive for radiograph projection differences of cemented THAs. The measurement errors that occur when radiographically projecting a three-dimensional THA were modeled. Based on the model, we developed a method to reduce the errors, thus approximating three-dimensional linear wear values, which are less sensitive for projection differences. An error analysis was performed by virtually simulating 144 wear measurements under varying... (More)
- Wear curves from individual patients often show unexplained irregular wear curves or impossible values (negative wear). We postulated errors of two-dimensional wear measurements are mainly the result of radiographic projection differences. We tested a new method that makes two-dimensional wear measurements less sensitive for radiograph projection differences of cemented THAs. The measurement errors that occur when radiographically projecting a three-dimensional THA were modeled. Based on the model, we developed a method to reduce the errors, thus approximating three-dimensional linear wear values, which are less sensitive for projection differences. An error analysis was performed by virtually simulating 144 wear measurements under varying conditions with and without application of the correction: the mean absolute error was reduced from 1.8 mm (range, 0-4.51 mm) to 0.11 mm (range, 0-0.27 mm). For clinical validation, radiostereometric analysis was performed on 47 patients to determine the true wear at 1, 2, and 5 years. Subsequently, wear was measured on conventional radiographs with and without the correction: the overall occurrence of errors greater than 0.2 mm was reduced from 35% to 15%. Wear measurements are less sensitive to differences in two-dimensional projection of the THA when using the correction method. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1144696
- author
- The, Bertram ; Flivik, Gunnar LU ; Diercks, Ron L and Verdonschot, Nico
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Clinical Orthopaedics and Related Research
- volume
- 466
- issue
- 3
- pages
- 684 - 690
- publisher
- Lippincott Williams & Wilkins
- external identifiers
-
- pmid:18264857
- wos:000253492700025
- scopus:42449131827
- pmid:18264857
- ISSN
- 0009-921X
- DOI
- 10.1007/s11999-007-0077-3
- language
- English
- LU publication?
- yes
- id
- 1cfde849-c03f-48ad-ab8f-1a718a94dabc (old id 1144696)
- date added to LUP
- 2016-04-01 12:11:47
- date last changed
- 2022-03-21 00:50:13
@article{1cfde849-c03f-48ad-ab8f-1a718a94dabc,
abstract = {{Wear curves from individual patients often show unexplained irregular wear curves or impossible values (negative wear). We postulated errors of two-dimensional wear measurements are mainly the result of radiographic projection differences. We tested a new method that makes two-dimensional wear measurements less sensitive for radiograph projection differences of cemented THAs. The measurement errors that occur when radiographically projecting a three-dimensional THA were modeled. Based on the model, we developed a method to reduce the errors, thus approximating three-dimensional linear wear values, which are less sensitive for projection differences. An error analysis was performed by virtually simulating 144 wear measurements under varying conditions with and without application of the correction: the mean absolute error was reduced from 1.8 mm (range, 0-4.51 mm) to 0.11 mm (range, 0-0.27 mm). For clinical validation, radiostereometric analysis was performed on 47 patients to determine the true wear at 1, 2, and 5 years. Subsequently, wear was measured on conventional radiographs with and without the correction: the overall occurrence of errors greater than 0.2 mm was reduced from 35% to 15%. Wear measurements are less sensitive to differences in two-dimensional projection of the THA when using the correction method.}},
author = {{The, Bertram and Flivik, Gunnar and Diercks, Ron L and Verdonschot, Nico}},
issn = {{0009-921X}},
language = {{eng}},
number = {{3}},
pages = {{684--690}},
publisher = {{Lippincott Williams & Wilkins}},
series = {{Clinical Orthopaedics and Related Research}},
title = {{A New Method to Make 2-D Wear Measurements Less Sensitive to Projection Differences of Cemented THAs}},
url = {{http://dx.doi.org/10.1007/s11999-007-0077-3}},
doi = {{10.1007/s11999-007-0077-3}},
volume = {{466}},
year = {{2008}},
}