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How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty

The correct cup position in total hip arthroplasty (THA) is usually assessed on anteroposterior low centered pelvic radiographs, harboring the risk of misinterpretation due to projection of a three-dimensional geometry on a two-dimensional plane. In the current study, we evaluate the effect of this...

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Autores principales: Weber, Markus, Meyer, Matthias, Von Kunow, Frederik, Füchtmeier, Bernd, Hillmann, Axel, Wulbrand, Christian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10302827/
https://www.ncbi.nlm.nih.gov/pubmed/37373870
http://dx.doi.org/10.3390/jpm13060881
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author Weber, Markus
Meyer, Matthias
Von Kunow, Frederik
Füchtmeier, Bernd
Hillmann, Axel
Wulbrand, Christian
author_facet Weber, Markus
Meyer, Matthias
Von Kunow, Frederik
Füchtmeier, Bernd
Hillmann, Axel
Wulbrand, Christian
author_sort Weber, Markus
collection PubMed
description The correct cup position in total hip arthroplasty (THA) is usually assessed on anteroposterior low centered pelvic radiographs, harboring the risk of misinterpretation due to projection of a three-dimensional geometry on a two-dimensional plane. In the current study, we evaluate the effect of this parallax effect on the cup inclination and anteversion in THA. In the course of a prospective clinical trial, 116 standardized low centered pelvic radiographs, as routinely obtained after THA, were evaluated regarding the impact of central beam deviation on the cup inclination and anteversion angles. Measurements of the horizontal and vertical beam offset with two different methods of parallax correction were compared with each other. Furthermore, the effect of parallax correction on the accuracy ofmeasuring the cup position was investigated. The mean difference between the two parallax correction methods was 0.2° ± 0.1° (from 0° to 0.4°) for the cup inclination and 0.1° ± 0.1° (from −0.1° to 0.2°) for the anteversion. For a typically intended cup position of a 45° inclination and 15° anteversion, the parallax effect led to a mean error of −1.5° ± 0.3° for the inclination and 0.6° ± 1.0° for the anteversion. Central beam deviation resulted in a projected higher cup inclination up to 3.7°, and this effect was more prominent in cups with higher anteversion. In contrast, the projected inclination decreased due to the parallax effect up to 3.2°, especially in cups with high inclination. The parallax effect on routinely obtained low centered pelvic radiographs is low and not clinically relevant due to the compensating effect of simultaneous medial and caudal central beam deviation.
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spelling pubmed-103028272023-06-29 How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty Weber, Markus Meyer, Matthias Von Kunow, Frederik Füchtmeier, Bernd Hillmann, Axel Wulbrand, Christian J Pers Med Brief Report The correct cup position in total hip arthroplasty (THA) is usually assessed on anteroposterior low centered pelvic radiographs, harboring the risk of misinterpretation due to projection of a three-dimensional geometry on a two-dimensional plane. In the current study, we evaluate the effect of this parallax effect on the cup inclination and anteversion in THA. In the course of a prospective clinical trial, 116 standardized low centered pelvic radiographs, as routinely obtained after THA, were evaluated regarding the impact of central beam deviation on the cup inclination and anteversion angles. Measurements of the horizontal and vertical beam offset with two different methods of parallax correction were compared with each other. Furthermore, the effect of parallax correction on the accuracy ofmeasuring the cup position was investigated. The mean difference between the two parallax correction methods was 0.2° ± 0.1° (from 0° to 0.4°) for the cup inclination and 0.1° ± 0.1° (from −0.1° to 0.2°) for the anteversion. For a typically intended cup position of a 45° inclination and 15° anteversion, the parallax effect led to a mean error of −1.5° ± 0.3° for the inclination and 0.6° ± 1.0° for the anteversion. Central beam deviation resulted in a projected higher cup inclination up to 3.7°, and this effect was more prominent in cups with higher anteversion. In contrast, the projected inclination decreased due to the parallax effect up to 3.2°, especially in cups with high inclination. The parallax effect on routinely obtained low centered pelvic radiographs is low and not clinically relevant due to the compensating effect of simultaneous medial and caudal central beam deviation. MDPI 2023-05-23 /pmc/articles/PMC10302827/ /pubmed/37373870 http://dx.doi.org/10.3390/jpm13060881 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Brief Report
Weber, Markus
Meyer, Matthias
Von Kunow, Frederik
Füchtmeier, Bernd
Hillmann, Axel
Wulbrand, Christian
How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty
title How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty
title_full How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty
title_fullStr How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty
title_full_unstemmed How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty
title_short How Relevant Is the Parallax Effect on Low Centered Pelvic Radiographs in Total Hip Arthroplasty
title_sort how relevant is the parallax effect on low centered pelvic radiographs in total hip arthroplasty
topic Brief Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10302827/
https://www.ncbi.nlm.nih.gov/pubmed/37373870
http://dx.doi.org/10.3390/jpm13060881
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