Bi-planar calibration method for templating of hip joint arthroplasty : phantom study and proof of concept
© 2023. The Author(s)..
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.
Medienart: |
E-Artikel |
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Erscheinungsjahr: |
2023 |
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Erschienen: |
2023 |
Enthalten in: |
Zur Gesamtaufnahme - volume:47 |
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Enthalten in: |
International orthopaedics - 47(2023), 5 vom: 07. Mai, Seite 1249-1257 |
Sprache: |
Englisch |
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Beteiligte Personen: |
Boese, Christoph Kolja [VerfasserIn] |
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Links: |
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Themen: |
Arthroplasty |
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Anmerkungen: |
Date Completed 10.04.2023 Date Revised 24.05.2023 published: Print-Electronic Citation Status MEDLINE |
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doi: |
10.1007/s00264-023-05747-4 |
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funding: |
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Förderinstitution / Projekttitel: |
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PPN (Katalog-ID): |
NLM353869449 |
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500 | |a Citation Status MEDLINE | ||
520 | |a © 2023. The Author(s). | ||
520 | |a 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 | ||
520 | |a 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 | ||
520 | |a 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) | ||
520 | |a 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 | ||
650 | 4 | |a Journal Article | |
650 | 4 | |a Arthroplasty | |
650 | 4 | |a Digital radiography | |
650 | 4 | |a Digital templating | |
650 | 4 | |a Joint arthroplasty | |
650 | 4 | |a Total hip arthroplasty | |
700 | 1 | |a Rolvien, Tim |e verfasserin |4 aut | |
700 | 1 | |a Henes, Frank Oliver |e verfasserin |4 aut | |
700 | 1 | |a Beil, Frank Timo |e verfasserin |4 aut | |
700 | 1 | |a Strahl, André |e verfasserin |4 aut | |
700 | 1 | |a Ries, Christian |e verfasserin |4 aut | |
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