Prosthetic manufacturers have developed shock-absorbing pylons to attenuate the transient forces of foot-ground contact in order to supplement the residual capacity of lower limb amputees. The purpose of this study was to measure the elastic and damping properties of two frequently prescribed pylons (the ICON™ Shock Pylon and the Mercury TT Pyramid Pylon) at frequencies enveloping those observed during gait using pseudo-static compressive and dynamic cyclic testing methods. Results showed that the spring constants were linear functions of deformation (ranging from 74 to 110 N/mm and 91 to 157 N/mm for the ICON and the TT Pylons, respectively) while the damping force was a function of the square root of velocity combined with a coulomb element and for the ICON and the TT Pylon, respectively).
Mechanical Properties of Shock-Absorbing Pylons Used in Transtibial Prostheses
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division November 9, 2002; revision received June 9, 2003. Associate Editor: A.D. McCulloch.
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Berge, , J. S., Klute, , G. K., and Czerniecki, , J. M. (March 9, 2004). "Mechanical Properties of Shock-Absorbing Pylons Used in Transtibial Prostheses ." ASME. J Biomech Eng. February 2004; 126(1): 120–122. https://doi.org/10.1115/1.1645865
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