Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept.
Arthroplasty
Digital radiography
Digital templating
Joint arthroplasty
Total hip arthroplasty
Journal
International orthopaedics
ISSN: 1432-5195
Titre abrégé: Int Orthop
Pays: Germany
ID NLM: 7705431
Informations de publication
Date de publication:
05 2023
05 2023
Historique:
received:
06
12
2022
accepted:
23
02
2023
medline:
10
4
2023
pubmed:
8
3
2023
entrez:
7
3
2023
Statut:
ppublish
Résumé
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. 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. 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). 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.
Identifiants
pubmed: 36881153
doi: 10.1007/s00264-023-05747-4
pii: 10.1007/s00264-023-05747-4
pmc: PMC10079716
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1249-1257Informations de copyright
© 2023. The Author(s).
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