Christoph K Boese1, Jan Bredow1, Jens Dargel1, Peer Eysel1, Hansjörg Geiges2, Philipp Lechler3. 1. Department of Orthopaedic and Trauma Surgery, University Hospital of Cologne, Cologne, Germany. 2. Mathematical Institute, University of Cologne, Cologne, Germany. 3. Centre for Orthopedic and Trauma Surgery, University of Giessen and Marburg, Marburg, Germany.
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.
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.
Authors: Christoph Kolja Boese; Sebastian Wilhelm; Stefan Haneder; Philipp Lechler; Peer Eysel; Jan Bredow Journal: Int Orthop Date: 2018-06-20 Impact factor: 3.075
Authors: Christoph Kolja Boese; Tim Rolvien; Matthias Trost; Michael Frink; Jan Hubert; Frank Timo Beil; Christian Ries Journal: Int J Comput Assist Radiol Surg Date: 2021-04-17 Impact factor: 2.924