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TECHNICAL BRIEFS

Mechanical Properties of Shock-Absorbing Pylons Used in Transtibial Prostheses

[+] Author and Article Information
Jocelyn S. Berge

Department of Veterans Affairs, Puget Sound Health Care System, Seattle, WA 98108

Glenn K. Klute

Department of Veterans Affairs, Puget Sound Health Care System, Seattle, WA 98108 University of Washington, Departments of Electrical Engineering and Mechanical Engineering, Seattle, WA 98195

Joseph M. Czerniecki

Department of Veterans Affairs, Puget Sound Health Care System, Seattle, WA 98108 University of Washington, Department of Rehabilitation Medicine, Seattle, WA 98195

J Biomech Eng 126(1), 120-122 (Mar 09, 2004) (3 pages) doi:10.1115/1.1645865 History: Received November 09, 2002; Revised June 09, 2003; Online March 09, 2004
Copyright © 2004 by ASME
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References

Radin,  E. L., Orr,  R. B., Kelman,  J. L., Paul,  I. L., and Rose,  R. M., 1982, “Effect of Prolonged Walking on Concrete on the Knees of Sheep,” J. Biomech., 15(7), pp. 487–492.
Radin,  E. L., Ehrlich,  M. G., Chernack,  R., Abernethy,  P., Paul,  I. L., and Rose,  R. M., 1978, “Effect of Repetitive Impulsive Loading on the Knee Joints of Rabbits,” Clin. Orthop., 131(March–April), pp. 288–293.
Sandover,  J., 1983, “Dynamic Loading as a Possible Source of Low-Back Disorders,” Spine, 8(6), pp. 652–658.
Brand, P. W., 1988, Repetitive Stress in the Development of Diabetic Foot Ulcers, C. V. Mosby and St. Louis, MO, pp. 83–90.
Whittle,  M. W., 1999, “Generation and Attenuation of Transient Impulsive Forces Beneath the Foot: A Review,” Gait Posture,10(3), pp. 264–275.
Schwellnus,  M. P., Jordaan,  G., and Noakes,  T. D., 1990, “Prevention of Common Overuse Injuries by the Use of Shock Absorbing Insoles. A Prospective Study,” Am. J. Sports Med., 18(6), pp. 636–641.
Smith,  W., Walter,  J., and Bailey,  M., 1985, “Effects of Insoles in Coast Guard Basic Training Footwear,” J. Am. Podiatr Med. Assoc., 75(12), pp. 644–647.
Gillespie,  K. A., and Dickey,  J. P., 2003, “Determination of the Effectiveness of Materials in Attenuating High Frequency Shock During Gait Using Filterbank Analysis,” Clin. Biomech. (Bristol, Avon), 18(1), pp. 50–59.
Anonymous, 1999, “ICON™ Shock Pylon,” TI 040 Rev. C, Flex-Foot, Inc., Aliso Viejo, CA.
Anonymous, 1999, “Fitting Instructions TT (Telescopic Torsion) Pyramid Pylon,” 938061/04-1198, Chas A Blatchford & Sons, Ltd., Hampshire, England, UK.
Cativo, J. J., 2002, “Email Regarding ICON’s Coefficient of Friction,” Personal Communication, February 26, 2002, Saint Gobain Performance Plastics, Bristol, RI.
Smart, C., 2002, “Email #2 Regarding the TT Pylon,” Personal Conversation, February 21, 2002, Chas A Blatchford & Sons, Ltd., Hampshire, England, UK.
Miller,  L. A., and Childress,  D. S., 1997, “Analysis of a Vertical Compliance Prosthetic Foot,” J. Rehabil. Res. Dev., 34(1), pp. 52–57.

Figures

Grahic Jump Location
Typical force versus displacement loading and unloading curves for the ICON and TT Pylon. The ICON was outfitted with an i6 spring and the TT Pylon with a Purple spring.
Grahic Jump Location
Damping force versus frequency for the ICON (n=4, mean ± S.D.) and TT Pylon (n=3, mean ± S.D.). Trend lines, R2 values, and equations represent the result of a least squares linear fit of each data set.
Grahic Jump Location
Damping force versus square root of velocity for ICON (n=4, mean ± S.D.) and TT Pylon (n=3, mean ± S.D.)

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