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Journal of the American Podiatric Medical Association
Volume 95 Number 4 370-375 2005
Copyright © 2005 American Podiatric Medical Association

Effect of Tube Angulation on the Measurement of Intermetatarsal Angles

René E. Weijers, MD *, Alphons G. H. Kessels, MSc {dagger}, Geert H. I. M. Walenkamp, MD, PhD {ddagger}, Henk van Mameren, MD, PhD § and Gerrit J. Kemerink, PhD *

* Department of Radiology, University Hospital Maastricht, Maastricht, the Netherlands.
{dagger} Departments of Clinical Epidemiology and Medical Technology Assessment, University Hospital Maastricht, Maastricht, the Netherlands.
{ddagger} Department of Orthopaedic Surgery, University Hospital Maastricht, Maastricht, the Netherlands.
§ Department of Anatomy and Embryology, University Maastricht, Maastricht, the Netherlands.

Corresponding author: René E. Weijers, MD, Department of Radiology, University Hospital Maastricht, P. Debyelaan 25, Maastricht 6202AZ, the Netherlands.

Abstract

We systematically investigated the effect of tube angulation on angular distortion of the anteroposterior radiograph of the foot. Three-dimensional data from the metatarsals originating from computed tomographic scans of ten healthy volunteers were projected onto the supporting surface at various tube angulations to simulate radiography. The distortion of the intermetatarsal angles decreased from 1.2° to 3.5° at 20° tube angulation to 0.4° to 2.7° at 0° tube angulation. The relatively small improvement in angular measurement using 0° instead of 15° tube angulation would not outweigh the adverse effects of changing the standard radiographic technique. Physician awareness of this source of error when planning surgical therapy seems more important. (J Am Podiatr Med Assoc 95(4): 370–375, 2005)






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Copyright © 2005 by the American Podiatric Medical Association.