The use of biplanar videoradiography technology has become increasingly popular for evaluating joint function in vivo. Two fundamentally different methods are currently employed to reconstruct 3D bone motions captured using this technology. Marker-based tracking requires at least three radio-opaque markers to be implanted in the bone of interest. Markerless tracking makes use of algorithms designed to match 3D bone shapes to biplanar videoradiography data. In order to reliably quantify in vivo bone motion, the systematic error of these tracking techniques should be evaluated. Herein, we present new markerless tracking software that makes use of modern GPU technology, describe a versatile method for quantifying the systematic error of a biplanar videoradiography motion capture system using independent gold standard instrumentation, and evaluate the systematic error of the W.M. Keck XROMM Facility’s biplanar videoradiography system using both marker-based and markerless tracking algorithms under static and dynamic motion conditions. A polycarbonate flag embedded with 12 radio-opaque markers was used to evaluate the systematic error of the marker-based tracking algorithm. Three human cadaveric bones (distal femur, distal radius, and distal ulna) were used to evaluate the systematic error of the markerless tracking algorithm. The systematic error was evaluated by comparing motions to independent gold standard instrumentation. Static motions were compared to high accuracy linear and rotary stages while dynamic motions were compared to a high accuracy angular displacement transducer. Marker-based tracking was shown to effectively track motion to within 0.1 mm and 0.1 deg under static and dynamic conditions. Furthermore, the presented results indicate that markerless tracking can be used to effectively track rapid bone motions to within 0.15 deg for the distal aspects of the femur, radius, and ulna. Both marker-based and markerless tracking techniques were in excellent agreement with the gold standard instrumentation for both static and dynamic testing protocols. Future research will employ these techniques to quantify in vivo joint motion for high-speed upper and lower extremity impacts such as jumping, landing, and hammering.
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e-mail: Joel_Schwartz@Brown.edu
e-mail: Joseph_Crisco@Brown.edu
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December 2011
Research Papers
Static and Dynamic Error of a Biplanar Videoradiography System Using Marker-Based and Markerless Tracking Techniques
Joel B. Schwartz,
Joel B. Schwartz
Bioengineering Laboratory, Department of Orthopaedics, The Warren Alpert Medical School,
e-mail: Joel_Schwartz@Brown.edu
Brown University and Rhode Island Hospital
, Providence, RI 02912
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Andrew C. Loomis,
Andrew C. Loomis
Center for Computation and Visualization,
Brown University
, Providence, RI 02912 e-mail:
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Elizabeth L. Brainerd,
Elizabeth L. Brainerd
Department of Ecology and Evolutionary Biology,
Brown University
, Providence, RI 02912 e-mail:
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Joseph J. Crisco
Joseph J. Crisco
Bioengineering Laboratory, Department of Orthopaedics, The Warren Alpert Medical School,
e-mail: Joseph_Crisco@Brown.edu
Brown University and Rhode Island Hospital
, Providence, RI 02912; School of Engineering, Brown University
, Providence, RI 02912
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Joel B. Schwartz
Bioengineering Laboratory, Department of Orthopaedics, The Warren Alpert Medical School,
Brown University and Rhode Island Hospital
, Providence, RI 02912e-mail: Joel_Schwartz@Brown.edu
Andrew C. Loomis
Center for Computation and Visualization,
Brown University
, Providence, RI 02912 e-mail:
Elizabeth L. Brainerd
Department of Ecology and Evolutionary Biology,
Brown University
, Providence, RI 02912 e-mail:
Joseph J. Crisco
Bioengineering Laboratory, Department of Orthopaedics, The Warren Alpert Medical School,
Brown University and Rhode Island Hospital
, Providence, RI 02912; School of Engineering, Brown University
, Providence, RI 02912e-mail: Joseph_Crisco@Brown.edu
J Biomech Eng. Dec 2011, 133(12): 121002 (8 pages)
Published Online: December 21, 2011
Article history
Received:
May 31, 2011
Revised:
November 18, 2011
Online:
December 21, 2011
Published:
December 21, 2011
Citation
Miranda, D. L., Schwartz, J. B., Loomis, A. C., Brainerd, E. L., Fleming, B. C., and Crisco, J. J. (December 21, 2011). "Static and Dynamic Error of a Biplanar Videoradiography System Using Marker-Based and Markerless Tracking Techniques." ASME. J Biomech Eng. December 2011; 133(12): 121002. https://doi.org/10.1115/1.4005471
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