title: Measurement of acetabular version based on biplanar radiographs with 3D reconstructions in comparison to CT as reference standard in cadavers.
abstract: To quantify acetabular version using 3 D reconstructions based on biplanar radiographs (BPR) with CT as reference standard. No institutional review board approval was needed. Nine dry-bone pelvises underwent BPR in five different positions (rotation/tilt). The 3 D models of each pelvis were reconstructed by two radiologists on the basis of anatomical landmarks using semi-automated software. Automated software was used to assess the 3 D models and to calculate acetabular versions perpendicular to the anterior pelvic plane on all levels in the craniocaudal direction in 1 mm steps. Transverse CT images perpendicular to the anterior pelvic plain were reconstructed through the acetabulum in 1 mm steps. Both readers measured acetabular version on each image. Inter-reader agreement was calculated. Measurements based on BPR and CT were compared. Inter-reader agreement was almost perfect for BPR-based acetabular version measurements (ICC (intraclass correlation coefficient) = 0.920, P < 0.0005) and CT (ICC = 0.990, P < 0.0005). Correlation of acetabular versions between the five BPR-positions was substantial/almost perfect (ICC = 0.722-0.887 and 0.749-0.872 for readers 1 and 2, respectively; most P < 0.0005). The acetabular version measurements between the ap-positioning from BPR and CT showed moderate agreement (mean CCC (concordance correlation coefficient) = 0.733 for reader 1, CCC = 0.755 for reader 2). Acetabular version on multiple levels can be measured using BPR and dedicated post-processing software and is relatively independent of pelvic rotation and tilt. Clin. Anat. 30:591-598, 2017. © 2017 Wiley Periodicals, Inc.
authors.affiliation: Radiology, Balgrist University Hospital, Zurich, CH-8008, Switzerland.|Faculty of Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Christoph A
authors.identifier: http://orcid.org/0000-0003-1861-541X
authors.initials: CA
authors.lastname: Agten
authors.affiliation: Radiology, Balgrist University Hospital, Zurich, CH-8008, Switzerland.|Faculty of Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Jonczy
authors.affiliation: Faculty of Medicine, University of Zurich, Zurich, Switzerland.|Institute of Anatomy, University of Zurich, Zurich, CH-8057, Switzerland.
authors.forename: Oliver
authors.initials: O
authors.lastname: Ullrich
authors.affiliation: Radiology, Balgrist University Hospital, Zurich, CH-8008, Switzerland.|Faculty of Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Christian W A
authors.initials: CWA
authors.lastname: Pfirrmann
authors.affiliation: Radiology, Balgrist University Hospital, Zurich, CH-8008, Switzerland.|Faculty of Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Reto
authors.initials: R
authors.lastname: Sutter
authors.affiliation: Radiology, Balgrist University Hospital, Zurich, CH-8008, Switzerland.|Faculty of Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Florian M
authors.initials: FM
authors.lastname: Buck
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging*; D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D012015:Reference Standards; D014057:Tomography, X-Ray Computed
keywords: acetabular retroversion; acetabulum; biplanar radiography; femoroacetabular impingement