Mechanical characterization of prosthetic feet using a prosthetic foot loading apparatus

Michel Sam; Andrew H. Hansen; Dudley S. Childress

doi:10.1109/IEMBS.2000.900479

Mechanical characterization of prosthetic feet using a prosthetic foot loading apparatus

Michel Sam, Andrew H. Hansen, Dudley S. Childress

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10 Scopus citations

Abstract

A Prosthetic Foot Loading Apparatus (PFLA) was modified and improved to measure the mechanical properties of different prosthetic feet. In this paper the properties of a SACH foot and a Flexwalk foot are examined to demonstrate application of the device. Roll-over shape of the feet was determined using a shank-based coordinate system. Damping ratios (ζ= 0.064 for SACH and ζ= 0.028 for Flexwalk) and resonant frequencies (ω_n = 5.46 Hz for SACH and ω_n = 2.90 Hz for Flexwalk) were also obtained. Roll-over shapes and damping ratios influence foot performance during walking. The PFLA is valuable for determining mechanical properties of commercially available prosthetic feet and as well as for evaluating design prototypes for new prosthetic feet.

Original language	English (US)
Pages (from-to)	1968-1971
Number of pages	4
Journal	Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume	3
DOIs	https://doi.org/10.1109/IEMBS.2000.900479
State	Published - 2000
Externally published	Yes

Keywords

Dynamic testing
Foot loading
Prosthetic feet
Prosthetic foot mechanics
Roll-over shapes

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AB - A Prosthetic Foot Loading Apparatus (PFLA) was modified and improved to measure the mechanical properties of different prosthetic feet. In this paper the properties of a SACH foot and a Flexwalk foot are examined to demonstrate application of the device. Roll-over shape of the feet was determined using a shank-based coordinate system. Damping ratios (ζ= 0.064 for SACH and ζ= 0.028 for Flexwalk) and resonant frequencies (ωn = 5.46 Hz for SACH and ωn = 2.90 Hz for Flexwalk) were also obtained. Roll-over shapes and damping ratios influence foot performance during walking. The PFLA is valuable for determining mechanical properties of commercially available prosthetic feet and as well as for evaluating design prototypes for new prosthetic feet.

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Mechanical characterization of prosthetic feet using a prosthetic foot loading apparatus

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