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Measurement of acetabular version based on biplanar radiographs with 3D reconstructions in comparison to CT as reference standard in cadavers
Author(s) -
Agten Christoph A.,
Jonczy Maciej,
Ullrich Oliver,
Pfirrmann Christian W.A.,
Sutter Reto,
Buck Florian M.
Publication year - 2017
Publication title -
clinical anatomy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 71
eISSN - 1098-2353
pISSN - 0897-3806
DOI - 10.1002/ca.22874
Subject(s) - acetabulum , medicine , intraclass correlation , pelvis , radiography , cadaver , nuclear medicine , correlation coefficient , transverse plane , rotation (mathematics) , tomography , orthodontics , anatomy , radiology , artificial intelligence , computer science , clinical psychology , psychometrics , machine learning
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.