Universität zu Köln

Boese, Christoph Kolja, Wilhelm, Sebastian, Haneder, Stefan, Lechler, Philipp, Eysel, Peer and Bredow, Jan (2019). Dual-position calibration markers for total hip arthroplasty: theoretical comparison to fixed calibration and single marker method. Int. Orthop., 43 (3). S. 589 - 596. NEW YORK: SPRINGER. ISSN 1432-5195

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Abstract

PurposeDigital templating is considered a standard for total hip arthroplasty. Different means for the necessary calibration of radiographs are known. While single marker calibration with radiopaque spheres is the most common, it is associated with possible significant deviations from the true magnification of the hip. Notably, fixed magnification factors showed better results. Therefore, a dual-position calibration marker method was simulated and compared to the established methods.MethodsFirst, an empirical fixed magnification factor was identified and applied to a series of radiographs. Second, three magnification factors were generated based on sagittal patient data of 398 CT scans. These methods were compared to the fixed factor.ResultsThe fixed factor was 122.6%. In the clinical application, the error of the fixed factor was 2.5% while the error of the single marker was 5.2%. In the CT cohort, the mean reference factor was 120.5% in females and 120.3% in males. The reference factor was compared to sex-specific means, sex-specific linear functions, and sex-specific cubic functions. The best results were found for the linear regression model with a mean difference of 0.8% from the reference value. No proportional bias was found (p=0.623).ConclusionThe simulation of the dual-position marker method using the linear regression model showed promising results, superior to all other methods. In future studies, its clinical application should be tested.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Boese, Christoph Kolja UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilhelm, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Haneder, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Lechler, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Eysel, Peer UNSPECIFIED UNSPECIFIED UNSPECIFIED Bredow, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-155456
DOI:	10.1007/s00264-018-4034-4
Journal or Publication Title:	Int. Orthop.
Volume:	43
Number:	3
Page Range:	S. 589 - 596
Date:	2019
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-5195
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ACCURACY Multiple languages Orthopedics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15545