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Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept

PURPOSE: Calibration of radiographs is a critical step in digital templating for hip arthroplasty. Calibration errors of > 1.5% lead to over- or undersizing of the templated implants and may affect logistics and patient safety. Contemporary calibration methods are known to be imprecise with avera...

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Autores principales: Boese, Christoph Kolja, Rolvien, Tim, Henes, Frank Oliver, Beil, Frank Timo, Strahl, André, Ries, Christian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10079716/
https://www.ncbi.nlm.nih.gov/pubmed/36881153
http://dx.doi.org/10.1007/s00264-023-05747-4
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author Boese, Christoph Kolja
Rolvien, Tim
Henes, Frank Oliver
Beil, Frank Timo
Strahl, André
Ries, Christian
author_facet Boese, Christoph Kolja
Rolvien, Tim
Henes, Frank Oliver
Beil, Frank Timo
Strahl, André
Ries, Christian
author_sort Boese, Christoph Kolja
collection PubMed
description PURPOSE: Calibration of radiographs is a critical step in digital templating for hip arthroplasty. Calibration errors of > 1.5% lead to over- or undersizing of the templated implants and may affect logistics and patient safety. Contemporary calibration methods are known to be imprecise with average errors of 6.5% and wide variance. A novel bi-planar radiograph-based calibration method is proposed, and a phantom study was conducted as proof of concept. METHODS: A spherical external calibration marker (ECM) is placed in front of the pubic symphysis of a pelvic bone model at twelve different positions. For each marker position, standard anteroposterior radiographs and four corresponding lateral radiographs with different degrees of rotation (0°–30°) are taken (overall, 60 radiographs). Calibration factors are calculated for an internal calibration marker (ICM) at the centre of the right hip (reference) and the ECM using a novel algorithm. Rotation and marker positions simulate foreseeable use errors and misplacements and aim to test robustness of the method against these errors. RESULTS: ECM calibration factor was 125.9% (range 124.7–127.2), and the mean ICM calibration factor was 126.6% (range 126.2–127.1) ([Formula: see text] ). Four images (8.3%) were beyond the 1% error threshold (all with 30° rotation). The mean difference was 0.79% (SD 0.49). CONCLUSION: The bi-planar method precisely predicts the true calibration factor of the hip joint plane under various conditions. In lateral radiographs, rotation of up to 20° did not adversely affect the precision and all images had calibration errors below the threshold for clinical significance. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00264-023-05747-4.
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spelling pubmed-100797162023-04-08 Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept Boese, Christoph Kolja Rolvien, Tim Henes, Frank Oliver Beil, Frank Timo Strahl, André Ries, Christian Int Orthop Original Paper PURPOSE: Calibration of radiographs is a critical step in digital templating for hip arthroplasty. Calibration errors of > 1.5% lead to over- or undersizing of the templated implants and may affect logistics and patient safety. Contemporary calibration methods are known to be imprecise with average errors of 6.5% and wide variance. A novel bi-planar radiograph-based calibration method is proposed, and a phantom study was conducted as proof of concept. METHODS: A spherical external calibration marker (ECM) is placed in front of the pubic symphysis of a pelvic bone model at twelve different positions. For each marker position, standard anteroposterior radiographs and four corresponding lateral radiographs with different degrees of rotation (0°–30°) are taken (overall, 60 radiographs). Calibration factors are calculated for an internal calibration marker (ICM) at the centre of the right hip (reference) and the ECM using a novel algorithm. Rotation and marker positions simulate foreseeable use errors and misplacements and aim to test robustness of the method against these errors. RESULTS: ECM calibration factor was 125.9% (range 124.7–127.2), and the mean ICM calibration factor was 126.6% (range 126.2–127.1) ([Formula: see text] ). Four images (8.3%) were beyond the 1% error threshold (all with 30° rotation). The mean difference was 0.79% (SD 0.49). CONCLUSION: The bi-planar method precisely predicts the true calibration factor of the hip joint plane under various conditions. In lateral radiographs, rotation of up to 20° did not adversely affect the precision and all images had calibration errors below the threshold for clinical significance. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00264-023-05747-4. Springer Berlin Heidelberg 2023-03-07 2023-05 /pmc/articles/PMC10079716/ /pubmed/36881153 http://dx.doi.org/10.1007/s00264-023-05747-4 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Original Paper
Boese, Christoph Kolja
Rolvien, Tim
Henes, Frank Oliver
Beil, Frank Timo
Strahl, André
Ries, Christian
Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
title Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
title_full Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
title_fullStr Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
title_full_unstemmed Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
title_short Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
title_sort bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10079716/
https://www.ncbi.nlm.nih.gov/pubmed/36881153
http://dx.doi.org/10.1007/s00264-023-05747-4
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