Journal of Rehabilitation Research & Development (JRRD)

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Volume 47 Number 7, 2010
   Pages 629 — 642

Abstract???????An indentation apparatus for evaluating discomfort and pain thresholds in conjunction with mechanical properties of foot tissue in vivo

Shuping Xiong, PhD;1 Ravindra S. Goonetilleke, PhD;2* Channa P. Witana, PhD;2 W. D. Asanka S. Rodrigo, MSc2

1Department of Industrial Engineering and Management, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China; 2Human Performance Laboratory, Department of Industrial Engineering and Logistics Management, Hong Kong University of Science and Technology, Hong Kong, China

Abstract —  The mechanical properties of human foot tissue in vivo as well as discomfort and pain thresholds are important for various applications. In this study, an apparatus for measuring the discomfort and pain thresholds and the mechanical properties of human tissues is presented. The apparatus employs a stepper motor that controls the indentation speed, as well as a load cell and potentiometer that determine the corresponding reaction force and tissue deformation (displacement), respectively. A LabVIEW program (LabVIEW 8, National Instruments Corporation; Austin, Texas) was developed to control the indentation via a data acquisition card. The apparatus can accommodate indentor displacements up to 35 mm and can impart forces up to 150 N at a controlled indentation speed in the range of 0 to 10 mm/s. Tests showed that the displacement measurement error is <0.17 mm in the nominal range (0.5% in the full scale) and the measurement error of force is <1.6 N in the nominal range (1.1% in the full scale). Experimental results indicate that the apparatus is reliable and flexible for measuring the mechanical properties of foot tissue in vivo in conjunction with pain and discomfort thresholds.

Key words: algometer, diabetic foot, discomfort, discomfort threshold, foot, heel compression, indentation, pain, pain threshold, repeatability, tissue, tissue indentor, tissue mechanical properties, tissue stiffness.


This article and any supplementary material should be cited as follows:
Xiong S, Goonetilleke RS, Witana CP, Rodrigo WDAS. An indentation apparatus for evaluating discomfort and pain thresholds in conjunction with mechanical properties of foot tissue in vivo. J Rehabil Res Dev. 2010; 47(7): 629-42.
DOI:10.1682/JRRD.2009.09.0152

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Last Reviewed or Updated  Thursday, October 7, 2010 9:57 AM

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