Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5032676 | Medical Engineering & Physics | 2017 | 6 Pages |
Abstract
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 0.43â±â0.22 mm and 0.66â±â0.43° for static and 0.59â±â0.10 mm and 0.71â±â0.12° 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.
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Authors
Janelle A. Cross, Benjamin D. McHenry, Robert Molthen, Emily Exten, Taly Gilat Schmidt, Gerald F. Harris,