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- Title
Source-to-detector distance and beam center do not affect radiographic measurements of acetabular morphology.
- Authors
Goldman, Ashton; Hoover, Kevin; Goldman, Ashton H; Hoover, Kevin B
- Abstract
<bold>Objective: </bold>Multiple radiographic acquisition techniques have been evaluated for their effect on measurements of acetabular morphology. This cadaveric study examined the effect of two acquisition parameters not previously evaluated: beam center position and source-to-detector distance. This study also evaluated the effect of reader differences on measurements.<bold>Methods: </bold>Following calibration of measurements between two readers using five clinical radiographs (training), radiographs were obtained from two cadavers using four different source-to-detector distances and three different radiographic centers for a total of 12 radiographic techniques (experimental). Two physician readers acquired four types of measurements from each cadaver radiograph: lateral center edge angle, peak-to-edge distance, Sharp's angle, and the Tonnis angle. All measurements were evaluated for intra-class correlation coefficient (ICC), kappa statistics for hip dysplasia, and factors that resulted in measurement differences using a mixed statistical model.<bold>Results: </bold>After training of the two physician readers, there was strong agreement in their hip morphology measurements (ICC 0.84-0.93), agreement in the presence of hip dysplasia (κ = 0.58-1.0), and no measurement difference between physician readers (p = 0.12-1.0). Experimental cadaver measurements showed moderate-to-strong agreement of the readers (ICC 0.74-0.93) and complete agreement on dysplasia (κ = 1). After accounting for reader and radiographic technique, there was no difference in hip morphology measurements (p = 0.83-0.99).<bold>Conclusions: </bold>In this cadaveric study, measurements of hip morphology were not affected by varying source-to-detector distance or beam center. We conclude that these acquisition parameters are not likely to affect the diagnosis of hip dysplasia in a clinical setting.
- Subjects
ACETABULUM (Anatomy); MORPHOLOGY; COHEN'S kappa coefficient (Statistics); CONGENITAL hip dislocation; RADIOGRAPHS; DEAD; HIP joint dislocation; RADIOGRAPHY; RESEARCH evaluation; RESEARCH bias
- Publication
Skeletal Radiology, 2017, Vol 46, Issue 4, p477
- ISSN
0364-2348
- Publication type
journal article
- DOI
10.1007/s00256-017-2571-3