Calibration Marker Position in Digital Templating of Total Hip Arthroplasty

Abstract Background We report a mathematical method to assess the vertical and horizontal positions of spherical radiopaque objects of known size in conventional radiographs. Methods The reliability and validity of the method were tested in an experimental setting and applied to 100 anteroposterior...

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Bibliographic Details
Published in:The Journal of arthroplasty 2016-04, Vol.31 (4), p.883-887
Main Authors: Boese, Christoph K., MD, Bredow, Jan, MD, Dargel, Jens, MD, Eysel, Peer, MD, Geiges, Hansjörg, MD, Lechler, Philipp, MD
Format: Article
Language:English
Subjects:
Acetabulum - diagnostic imaging
Acetabulum - surgery
Arthroplasty, Replacement, Hip
Calibration
digital radiography
Femur - diagnostic imaging
Femur - surgery
hip anatomy
Hip Joint - diagnostic imaging
Hip Joint - surgery
Humans
Male
Models, Theoretical
Orthopedics
Pelvic Bones - diagnostic imaging
Radiography
Reproducibility of Results
Software
templating
total hip arthroplasty
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Summary:Abstract Background We report a mathematical method to assess the vertical and horizontal positions of spherical radiopaque objects of known size in conventional radiographs. Methods The reliability and validity of the method were tested in an experimental setting and applied to 100 anteroposterior pelvic radiographs with external calibration markers and unilateral total hip arthroplasty (THA). Results We found excellent reliabilities; intraclass correlation coefficients for interobserver and intraobserver reliabilities were 0.999-1.000 ( P  = .000). The mean normal height of THA was 198 mm (range: 142-243 mm, standard deviation: 18 mm) above the detector. Vertical and horizontal external marker positions differed significantly from the true hip center (THA; P < .001 and P  = .017). Conclusion This method could enhance patient safety by enabling automated detection of malpositioned calibration markers by templating software.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2015.10.009