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This article and any supplementary material should be cited as follows: Redfield MT, Cagle JC, Hafner BJ, Sanders JE. Classifying prosthetic use via accelerometry in persons with transtibial amputations. J Rehabil Res Dev. 2013;50(9):XXX–XXX. http://dx.doi.org/10.1682/JRRD.2012.12.0233
Slideshow ProjectDOI:10.1682/JRRD.2012.12.0233JSP
Classifying prosthetic use via accelerometry in persons with
transtibial amputations
Morgan T. Redfield, MSEE; John C. Cagle, BSE; Brian J. Hafner, PhD; Joan E. Sanders, PhD
This article and any supplementary material should be cited as follows: Redfield MT, Cagle JC, Hafner BJ, Sanders JE. Classifying prosthetic use via accelerometry in persons with transtibial amputations. J Rehabil Res Dev. 2013;50(9):XXX–XXX. http://dx.doi.org/10.1682/JRRD.2012.12.0233
Slideshow ProjectDOI:10.1682/JRRD.2012.12.0233JSP
• Aim– Use 3-axis accelerometer to characterize activities and
body postures in transtibial amputation. • Relevance– How persons with amputation use their prostheses over
time may facilitate rehabilitation and enhance understanding of prosthesis functionality.
– Existing monitoring and classification systems are often limited, record data over short periods, and/or classify limited activities and body postures.
This article and any supplementary material should be cited as follows: Redfield MT, Cagle JC, Hafner BJ, Sanders JE. Classifying prosthetic use via accelerometry in persons with transtibial amputations. J Rehabil Res Dev. 2013;50(9):XXX–XXX. http://dx.doi.org/10.1682/JRRD.2012.12.0233
Slideshow ProjectDOI:10.1682/JRRD.2012.12.0233JSP
Method• Accelerometers were mounted on prosthetic
pylons of 10 persons with transtibial amputation as they performed preset routine of actions.
• Accelerometer data was postprocessed with binary decision tree to:– Identify when prosthesis was being worn.– Classify use as movement, standing, or sitting.
• Classifications were compared to visual observation by study researchers.
This article and any supplementary material should be cited as follows: Redfield MT, Cagle JC, Hafner BJ, Sanders JE. Classifying prosthetic use via accelerometry in persons with transtibial amputations. J Rehabil Res Dev. 2013;50(9):XXX–XXX. http://dx.doi.org/10.1682/JRRD.2012.12.0233
Slideshow ProjectDOI:10.1682/JRRD.2012.12.0233JSP
Results
• Classifier achieved average accuracy of 96.6%.
This article and any supplementary material should be cited as follows: Redfield MT, Cagle JC, Hafner BJ, Sanders JE. Classifying prosthetic use via accelerometry in persons with transtibial amputations. J Rehabil Res Dev. 2013;50(9):XXX–XXX. http://dx.doi.org/10.1682/JRRD.2012.12.0233
Slideshow ProjectDOI:10.1682/JRRD.2012.12.0233JSP
Conclusion
• Information provided by this system may:– Help clinicians in fitting prostheses, selecting
components, or training patients. – Be useful for automatic feedback control to adjust
prosthesis mechanisms based on activity and posture.