Magnification of digital hip radiographs differs between clinical workplaces

Preoperative planning for total hip arthroplasty includes templating on anteroposterior radiographs. It is necessary to consider radiographic magnification in order to scale templates accurately. Studies dealing with hip templating report different values of radiographic magnification. It is not cle...

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Bibliographic Details
Published in:	PloS one Vol. 12; no. 11; p. e0188743
Main Authors:	Hornová, Jana, Růžička, Pavel, Hrubina, Maroš, Šťastný, Eduard, Košková, Andrea, Fulín, Petr, Gallo, Jiří, Daniel, Matej
Format:	Journal Article
Language:	English
Published:	United States Public Library of Science 30-11-2017 Public Library of Science (PLoS)
Subjects:	Arthroplasty Biology and Life Sciences Engineering and Technology Medicine and Health Sciences People and places Radiography Social Sciences
Online Access:	Get full text
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Summary:	Preoperative planning for total hip arthroplasty includes templating on anteroposterior radiographs. It is necessary to consider radiographic magnification in order to scale templates accurately. Studies dealing with hip templating report different values of radiographic magnification. It is not clear if the observed difference in magnification between the studies is caused by variability in studied groups, methodology or instrumentation. We hypothesize that there is a difference in magnification between clinical workplaces. Within this study, radiographic magnification was estimated on 337 radiographs of patients after total hip surgery from five orthopaedic departments in the Czech Republic. Magnification was determined for each patient as a ratio between diameter of implanted femoral head measured on radiogram and its true size. One-way ANOVA revealed significant differences in magnification between workplaces (F(4,332) = 132, p≤0.001). These results suggest that radiographic magnification depends on the workplace where it is taken or more precisely on radiographic device. It indicates potential limits in generalizability of results of studies dealing with preoperative planning accuracy to other institutions.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Current address: Orthopaedic Clinic, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava and University Hospital Martin, Martin, Slovak Republic Competing Interests: The authors have declared that no competing interests exist.
ISSN:	1932-6203 1932-6203
DOI:	10.1371/journal.pone.0188743