Errors in measuring sagittal arch kinematics of the human foot with digital fluoroscopy

Wearing, SC, Smeathers, JE, Yates, B, Sullivan, PM, Urry, SR and Dubois, P (2005) Errors in measuring sagittal arch kinematics of the human foot with digital fluoroscopy. Gait & Posture, 21 3: 326-332. doi:10.1016/j.gaitpost.2004.04.003


Author Wearing, SC
Smeathers, JE
Yates, B
Sullivan, PM
Urry, SR
Dubois, P
Title Errors in measuring sagittal arch kinematics of the human foot with digital fluoroscopy
Journal name Gait & Posture   Check publisher's open access policy
ISSN 0966-6362
Publication date 2005-04-01
Year available 1987
Sub-type Article (original research)
DOI 10.1016/j.gaitpost.2004.04.003
Open Access Status Not yet assessed
Volume 21
Issue 3
Start page 326
End page 332
Total pages 7
Place of publication CLARE
Publisher MACMILLAN MAGAZINES LTD
Language eng
Abstract Although fluoroscopy has been used to evaluate motion of the foot during gait, the accuracy and precision of fluoroscopic measures of osseous structures of the foot has not been reported in the literature. This study reports on a series of experiments that quantify the magnitude and sources of error involved in digital fluoroscopic measurements of the mediaL longitudinal arch. The findings indicate that with a global distortion correction procedure, errors arising from image distortion can be reduced threefold to 0.2 degrees for angular measurements and to 0.1 mm for linear measures. The limits of agreement for repeated angular measures of the calcaneus and first metatarsal were +/- 10.5 degrees and +/- 0.6 degrees, indicating that measurement error was primarily associated with the manual process of digitisation. While the magnitude of the residual error constitutes about +/- 2.5% of the expected 20 degrees of movement of the calcaneus and first metatarsal, out-of-plane rotation may potentially contribute the greatest source of error in fluoroscopic measures of the foot. However, even at the extremes of angular displacement (15 degrees) reported for the calcaneum during running gait, the root mean square (RMS) error was only about 1 degrees. Thus, errors associated with fluoroscopic imaging of the foot appear to be negligible when compared to those arising from skin movement artefact, which typically range between 1.5 and 4 mm (equating to errors of 2 degrees to 17 degrees for angular measures). Fluoroscopy, therefore, may be a useful technique for analysing the sagittal movement of the medial longitudinal arch during the contact phase of walking. (c) 2004 Elsevier B.V. All rights reserved.
Keyword accuracy
precision
foot
X-ray
motion analysis
Human Heel Pad
In-Vivo
Stance Phase
Distortion Correction
Imaging Chain
Lumbar Spine
Gait
Walking
Videofluoroscopy
Displacement
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: ResearcherID Downloads - Archived
 
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