Biplane fluoroscopy for hindfoot motion analysis during gait: A model-based evaluation. Med Eng Phys 2017 May;43:118-123
Date
03/06/2017Pubmed ID
28259613DOI
10.1016/j.medengphy.2017.02.009Scopus ID
2-s2.0-85014069215 (requires institutional sign-in at Scopus site) 33 CitationsAbstract
The purpose of this study was to quantify the accuracy and precision of a biplane fluoroscopy system for model-based tracking of in vivo hindfoot motion during over-ground gait. Gait was simulated by manually manipulating a cadaver foot specimen through a biplane fluoroscopy system attached to a walkway. Three 1.6-mm diameter steel beads were implanted into the specimen to provide marker-based tracking measurements for comparison to model-based tracking. A CT scan was acquired to define a gold standard of implanted bead positions and to create 3D models for model-based tracking. Static and dynamic trials manipulating the specimen through the capture volume were performed. Marker-based tracking error was calculated relative to the gold standard implanted bead positions. The bias, precision, and root-mean-squared (RMS) error of model-based tracking was calculated relative to the marker-based measurements. The overall RMS error of the model-based tracking method averaged 0.43 ± 0.22mm and 0.66 ± 0.43° for static and 0.59 ± 0.10mm and 0.71 ± 0.12° for dynamic trials. The model-based tracking approach represents a non-invasive technique for accurately measuring dynamic hindfoot joint motion during in vivo, weight bearing conditions. The model-based tracking method is recommended for application on the basis of the study results.
Author List
Cross JA, McHenry BD, Molthen R, Exten E, Schmidt TG, Harris GFAuthors
Gerald Harris PhD Director in the Orthopaedic Research Engineering Center (OREC) department at Marquette UniversityGerald F. Harris Emeritus Professor in the Orthopaedic Surgery department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
AdultFluoroscopy
Foot
Gait
Humans
Image Processing, Computer-Assisted
Male
Models, Anatomic
Tomography, X-Ray Computed
