Journal of Rehabilitation Research & Development (JRRD)

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Volume 49 Number 3, 2012
   Pages 427 — 438

Abstract — Validity of method to quantify transtibial amputees’ free-living prosthetic wearing times and physical activity levels when using suction suspension sockets

Kit Tzu Tang, EngD;1–2 William D. Spence;3 Douglas Maxwell;3 Benedict William Stansfield, PhD4*

1Bioengineering Unit, University of Strathclyde, Glasgow, United Kingdom; 2Medical Physics and Clinical Engineering, St. James Hospital, Leeds, United Kingdom; 3PAL Technologies Ltd, Glasgow, United Kingdom; 4School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, United Kingdom

Abstract — Prostheses are prescribed to restore the mobility of people with amputated lower limbs. Monitoring the prosthesis wearing times and physical activity of prosthesis users would provide invaluable information regarding rehabilitation progress and suitability of the prosthesis. The validation of a method to determine wearing times and physical activity state, as well as strides taken, of amputees wearing suction suspension sockets is reported. Eight participants with transtibial amputation were fitted with custom-made suction sockets. Analysis algorithms were used to automatically characterize physical activity based on the pressure at the socket’s relief valve. The algorithms were validated in a laboratory-based protocol that included walking, stair climbing, standing, sitting, donning, and doffing. Intraclass correlation coefficient (2,1) values of >0.98 were achieved with mean differences of  –2.0%, 0.3%, 1.3%, and 0.7% for agreement between "off," "static," and "dynamic" times and stride count, respectively, as determined by the analysis algorithms and a concurrent video analysis. This study demonstrates that an interpretation of the pressure at the pressure-relief valve of suction suspension sockets can be used to determine wearing times and activity state.

Key words: activity monitor, doff time, physical activity characterization, pressure monitoring, prosthesis wearing times, rehabilitation, residual limb, stepping, suction suspension socket, transtibial amputee.


View HTML  ¦  View PDF  ¦  Contents Vol. 49, No. 3
This article and any supplementary material should be cited as follows:
Tang KT, Spence WD, Maxwell D, Stansfield BW. Validity of method to quantify transtibial amputees’ free-living prosthetic wearing times and physical activity levels when using suction suspension sockets. J Rehabil Res Dev. 2012;49(3):427–38.
http://dx.doi.org/10.1682/JRRD.2010.12.0241
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Last Reviewed or Updated  Thursday, April 26, 2012 11:52 AM

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