Journal of Rehabilitation Research & Development (JRRD)

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Stance phase mechanical characterization of transtibial prostheses distal to the socket: A review

Matthew J. Major, PhD, et al.

Figure 2. Schematic illustration of (a) Voigt and (b) Kelvin lumped parameter models. For adapted Voigt model used in study by Klute et al. [29], equation for foot-ground reaction force, Fg, as function of displacement, x, was Fg = axb + sign(x)cxd|x|e; where a is stiffness coefficient, c is damping coefficient, and sign(x) is -1 for x 0 and –1 for < 0. Note inclusion of position-dependent factor in damping element. By setting exponents b and e to 1 and d to 0, this model would represent linear spring and damper, as used in Voigt model by Miller and Childress [15].

Achieving the required functionality of a below-knee prosthesis during the weight-bearing phase of walking (e.g., shock absorption, close to normal rollover characteristics, and smooth transition into swing) depends on the mechanical properties of the prosthesis that directly influence the performance of the amputee. We define these properties as those characterized independent of the amputee and that reflect the overall behavior of the prosthesis, not its detailed design. Based on a review of previous work on prosthesis mechanical characterization, we conclude that a comprehensive and standardized method is required to properly represent the desired prosthesis properties for effective and efficient component design and prescription.

Volume 49 Number 6, 2012
   Pages 815 — 830

View HTML  ¦  View PDF  ¦  Contents Vol. 49, No. 6
This article and any supplementary material should be cited as follows:
Major MJ, Kenney LP, Twiste M, Howard D. Stance phase mechanical characterization of transtibial prostheses distal to the socket: A review. J Rehabil Res Dev. 2012;49(6): 815–30.

Last Reviewed or Updated  Thursday, August 16, 2012 11:17 AM

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