Loweg, Lemmard, Trost, Matthias ORCID: 0000-0002-4984-6985, Kutzner, Karl Philipp, Ries, Christian and Boese, Christoph Kolja (2020). A novel calibration method for digital templating of total hip arthroplasty: a prospective clinical study of dual scale type single marker calibration in supine radiographs. Int. Orthop., 44 (9). S. 1693 - 1700. NEW YORK: SPRINGER. ISSN 1432-5195

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Background External calibration markers (ECM) are the standard of care for digital templating in joint replacements. Spherical mono markers are known to be unreliable. Fixed calibration factors (FCF) can reduce the overall error by placement of markers, but do not address individual patient anatomy. Dual scale calibration marker (DSCM) methods were developed to improve precision of calibration but require two markers. This prospective observational study is the first to analyse the application of a dual scale type single marker (DSSM) method in supine radiographs. Methods One hundred patients with unilateral total hip arthroplasty (THA) underwent anterior-posterior pelvis X-ray with ECM and DSSM. The femoral THA head components were used as internal reference (ICM). An empirical fixed calibration factor (FCF; 120%) was used as comparator. Absolute differences of ICM and both ECM and DSSM were calculated. Absolute relative deviations (ARD) were calculated. Results Mean absolute calibration factor differences of ECM, FCF and DSSM from ICM were 0.105 (0.002-0.182), 0.016 (0.082-0.013) and 0.011 (0.056-0.009), respectively. ARD differences between ECM and DSSM as well as FCF and DSSM were significant (p < 0.001). Conclusion The DSSM method showed superior results over ECM and FCF to predict the optimal calibration factor in supine radiographs. The novel DSSM method could be used to improve digital templating in supine radiographs without need for additional markers.

Item Type: Journal Article
CreatorsEmailORCIDORCID Put Code
Trost, MatthiasUNSPECIFIEDorcid.org/0000-0002-4984-6985UNSPECIFIED
URN: urn:nbn:de:hbz:38-333704
DOI: 10.1007/s00264-020-04597-8
Journal or Publication Title: Int. Orthop.
Volume: 44
Number: 9
Page Range: S. 1693 - 1700
Date: 2020
Publisher: SPRINGER
Place of Publication: NEW YORK
ISSN: 1432-5195
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
MAGNIFICATIONMultiple languages
OrthopedicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/33370


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