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Validation of a CT image based software for three-dimensional measurement of acetabular cup orientation

Validation of a CT image based software for three-dimensional measurement of acetabular cup orientation
Validation of a CT image based software for three-dimensional measurement of acetabular cup orientation
The purpose of our study was to develop a simple and reproducible method for calculating post-operative acetabular cup position based upon computed tomographic images. Next, we sought to examine the reliability, objectivity and accuracy of this method. We developed a 3D CT evaluation software based upon Amira(R) (data visualisation, analysis and modelling software) to calculate the abduction and anteversion of the acetabular cup relative to the APP (anterior pelvic plane). To test the accuracy of the method, we constructed a special phantom pelvic model as the gold standard, in which the acetabulum was mounted at various abduction and anteversion angles that had previously been measured digitally. This phantom was then CT scanned in 12 different cup positions (30 degrees to 50 degrees abduction, 0 degrees to 30 degrees anteversion) and then evaluated using the 3D CT evaluation software. In addition, we also examined the reliability and objectivity of this method in 10 patients following implantation of a hip prosthesis, as a clinical trial. We observed an average accuracy of the 3D CT evaluation software of -0.3 degrees (range -1.4 degrees to 1.3 degrees ; SD 0.6 degrees ) for abduction and 0.2 degrees (range -1.4 degrees to 1.4 degrees ; SD 0.6 degrees ) for anteversion compared with the gold standard. Moreover, a high intra -and interindividual agreement in the resulting ICC well above 0.8 for abduction and abduction values in the phantom study and the clinical trial were observed. This study found that the 3D CT evaluation software provides high reliability, objectivity and accuracy. Thus, the 3D CT software is a method that permits very precise evaluation of the post-operative cup position independent of patient positioning or pelvic tilt
acetabulum/ radiography, humans, imaging, three-dimensional, pelvis, posture, reproducibility of results, software, tomography, x-ray computed/ methods
185-193
Wassilew, Georgi I.
b8226f26-299a-42c2-be01-4ccd32235cdf
Janz, Viktor
279dc6bd-848e-4d83-99b6-d976efe10bdd
Heller, Markus
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Wenzl, Marcus
6c2119ce-a171-4937-91aa-b3262bdf2b96
Perka, Carsten
50eac0cf-e710-45df-a04b-b8af775eace1
Hasart, Olaf
e42f42bc-77a2-45c3-a05a-ed2af19f26f2
Wassilew, Georgi I.
b8226f26-299a-42c2-be01-4ccd32235cdf
Janz, Viktor
279dc6bd-848e-4d83-99b6-d976efe10bdd
Heller, Markus
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Wenzl, Marcus
6c2119ce-a171-4937-91aa-b3262bdf2b96
Perka, Carsten
50eac0cf-e710-45df-a04b-b8af775eace1
Hasart, Olaf
e42f42bc-77a2-45c3-a05a-ed2af19f26f2

Wassilew, Georgi I., Janz, Viktor, Heller, Markus, Wenzl, Marcus, Perka, Carsten and Hasart, Olaf (2011) Validation of a CT image based software for three-dimensional measurement of acetabular cup orientation. Technology and Health Care, 19 (3), 185-193. (doi:10.3233/THC-2011-0629). (PMID:21957510)

Record type: Article

Abstract

The purpose of our study was to develop a simple and reproducible method for calculating post-operative acetabular cup position based upon computed tomographic images. Next, we sought to examine the reliability, objectivity and accuracy of this method. We developed a 3D CT evaluation software based upon Amira(R) (data visualisation, analysis and modelling software) to calculate the abduction and anteversion of the acetabular cup relative to the APP (anterior pelvic plane). To test the accuracy of the method, we constructed a special phantom pelvic model as the gold standard, in which the acetabulum was mounted at various abduction and anteversion angles that had previously been measured digitally. This phantom was then CT scanned in 12 different cup positions (30 degrees to 50 degrees abduction, 0 degrees to 30 degrees anteversion) and then evaluated using the 3D CT evaluation software. In addition, we also examined the reliability and objectivity of this method in 10 patients following implantation of a hip prosthesis, as a clinical trial. We observed an average accuracy of the 3D CT evaluation software of -0.3 degrees (range -1.4 degrees to 1.3 degrees ; SD 0.6 degrees ) for abduction and 0.2 degrees (range -1.4 degrees to 1.4 degrees ; SD 0.6 degrees ) for anteversion compared with the gold standard. Moreover, a high intra -and interindividual agreement in the resulting ICC well above 0.8 for abduction and abduction values in the phantom study and the clinical trial were observed. This study found that the 3D CT evaluation software provides high reliability, objectivity and accuracy. Thus, the 3D CT software is a method that permits very precise evaluation of the post-operative cup position independent of patient positioning or pelvic tilt

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More information

Published date: 2011
Keywords: acetabulum/ radiography, humans, imaging, three-dimensional, pelvis, posture, reproducibility of results, software, tomography, x-ray computed/ methods
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 348534
URI: http://eprints.soton.ac.uk/id/eprint/348534
PURE UUID: 5d28e96d-761b-40c9-bf64-86d1201f7bde
ORCID for Markus Heller: ORCID iD orcid.org/0000-0002-7879-1135

Catalogue record

Date deposited: 15 Feb 2013 09:32
Last modified: 17 Dec 2019 01:38

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