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Validation of CT image-based software for three-dimensional measurement of acetabular coverage profile

Validation of CT image-based software for three-dimensional measurement of acetabular coverage profile
Validation of CT image-based software for three-dimensional measurement of acetabular coverage profile

Background: plain radiography, 2-dimensional (2D) magnetic resonance imaging (MRI), and computed tomography (CT) do not precisely display morphology and acetabular coverage in developmental dysplasia of the hip or pincer-type femoroacetabular impingement. Pelvic position and pelvic tilt affect assessment of the acetabular parameters, leading to misinterpretation.

Objective: we tested a 3-dimensional (3D) CT evaluation script to calculate the crossover sign (COS), acetabular coverage and morphology.

Methods: to test the method, we constructed a phantom pelvic model, in which the acetabulum was mounted at different coverages of the femoral head, and simulated a COS and the acetabular morphology. Additionally we examined the reliability and objectivity of this method in ten patients with CT scans of the pelvis for conditions unrelated to hip disorders.

Results: we obtained an average accuracy of the 3D CT evaluation script of -0.37∘ (range -3.84 to 3.88; SD ± 1.43) for morphology, and 0.002% (range -7.28% to 6.90%; SD ± 1.60%) for coverage of the femoral head. Significant correlation between the expected and calculated COS (p= 0.01) was found.

Conclusions: our 3D CT evaluation script permits precise evaluation of the acetabular coverage profile, the presence or absence of a COS and acetabular morphology, independent of patient positioning or pelvic tilt.

Journal Article
989-1004
Wenzl, Marcus P.
90bc0908-7240-4afd-945c-40579f56e7df
Heller, Markus
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Janz, Viktor
279dc6bd-848e-4d83-99b6-d976efe10bdd
Perka, Carsten
50eac0cf-e710-45df-a04b-b8af775eace1
Wassilew, Georgi I.
b8226f26-299a-42c2-be01-4ccd32235cdf
Wenzl, Marcus P.
90bc0908-7240-4afd-945c-40579f56e7df
Heller, Markus
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Janz, Viktor
279dc6bd-848e-4d83-99b6-d976efe10bdd
Perka, Carsten
50eac0cf-e710-45df-a04b-b8af775eace1
Wassilew, Georgi I.
b8226f26-299a-42c2-be01-4ccd32235cdf

Wenzl, Marcus P., Heller, Markus, Janz, Viktor, Perka, Carsten and Wassilew, Georgi I. (2017) Validation of CT image-based software for three-dimensional measurement of acetabular coverage profile. Technology and Health Care, 25 (5), 989-1004. (doi:10.3233/THC-170932).

Record type: Article

Abstract

Background: plain radiography, 2-dimensional (2D) magnetic resonance imaging (MRI), and computed tomography (CT) do not precisely display morphology and acetabular coverage in developmental dysplasia of the hip or pincer-type femoroacetabular impingement. Pelvic position and pelvic tilt affect assessment of the acetabular parameters, leading to misinterpretation.

Objective: we tested a 3-dimensional (3D) CT evaluation script to calculate the crossover sign (COS), acetabular coverage and morphology.

Methods: to test the method, we constructed a phantom pelvic model, in which the acetabulum was mounted at different coverages of the femoral head, and simulated a COS and the acetabular morphology. Additionally we examined the reliability and objectivity of this method in ten patients with CT scans of the pelvis for conditions unrelated to hip disorders.

Results: we obtained an average accuracy of the 3D CT evaluation script of -0.37∘ (range -3.84 to 3.88; SD ± 1.43) for morphology, and 0.002% (range -7.28% to 6.90%; SD ± 1.60%) for coverage of the femoral head. Significant correlation between the expected and calculated COS (p= 0.01) was found.

Conclusions: our 3D CT evaluation script permits precise evaluation of the acetabular coverage profile, the presence or absence of a COS and acetabular morphology, independent of patient positioning or pelvic tilt.

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Accepted/In Press date: 16 June 2017
e-pub ahead of print date: 23 October 2017
Keywords: Journal Article

Identifiers

Local EPrints ID: 416434
URI: http://eprints.soton.ac.uk/id/eprint/416434
PURE UUID: 8d268d5b-4127-4cd2-a0d7-7aad8f792d70
ORCID for Markus Heller: ORCID iD orcid.org/0000-0002-7879-1135

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Date deposited: 15 Dec 2017 17:31
Last modified: 18 Feb 2021 17:19

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Contributors

Author: Marcus P. Wenzl
Author: Markus Heller ORCID iD
Author: Viktor Janz
Author: Carsten Perka
Author: Georgi I. Wassilew

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