Universität zu Köln

Boese, Christoph Kolja, Wilhelm, Sebastian, Haneder, Stefan, Lechler, Philipp, Eysel, Peer and Bredow, Jan (2019). Influence of calibration on digital templating of hip arthroplasty. Int. Orthop., 43 (8). S. 1799 - 1806. NEW YORK: SPRINGER. ISSN 1432-5195

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Abstract

IntroductionDigital templating for total joint replacement is the current standard. For image calibration, external calibration markers (ECM) are used. However, there are concerns regarding the precision of the method. This study aimed to identify the direct influence of calibration errors on digital templating.Patients and methodsA retrospective analysis of 100 post-operative radiographs with unilateral total hip arthroplasty was performed. The magnification factor of the ECM and of the internal prosthetic femoral head (ICM) as a reference value was calculated for each radiograph. Two blinded observers performed templating of the contralateral hip using a randomized list for all radiographs and both markers. The component size templated by the ECM magnification was compared to the reference by the ICM magnification.ResultsMean magnification factors of ICM and ECM differed significantly (p=0.006). The absolute difference was 5.2% (range 0.0-23.3%, SD 4.8%). Templating of the acetabular or the femoral component showed no significant differences (p=0.120, p=0.599). Differences of more than one size were found in 26% of the acetabular components and 14% of the femoral components and differences over two sizes in 10% respectively 3%. Correlation coefficients for magnification error and size differences of acetabular components were -0.645 (p<0.001) and for the femoral component -0.607 (p<0.001).InterpretationThe calibration error of external calibration markers in digital templating for hip replacement influences component sizes significantly. Thus, correct positioning of ECM is of utmost importance.

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:38-134074
DOI:	10.1007/s00264-018-4120-7
Journal or Publication Title:	Int. Orthop.
Volume:	43
Number:	8
Page Range:	S. 1799 - 1806
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; REPLACEMENT; MARKERS; KNEE Multiple languages Orthopedics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13407