Prosthetic foot roll-over shapes with implications for alignment of trans-tibial prostheses

Andrew Hansen, D. S. Childress, E. H. Knox

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

Roll-over shape is introduced as a significant characteristic of prosthetic feet. The roll-over shapes of the Flexwalk, Quantum, SACH, and SAFE prosthetic feet were determined using three methods; two involving quasi-static loading and one dynamic loading. The results show that foot roll-over shape properties obtained by quasi-static and by dynamic methods are similar. Relationships between foot roll-over shape and the alignment of trans-tibial prostheses are introduced that suggest ways to align trans-tibial prostheses without walking trials and iterations. The relationships may explain what prosthetists attempt to accomplish when they dynamically align a trans-tibial limb. They also explain why prosthetic feet with different mechanical properties usually necessitate different alignments, and may explain why a number of gait studies of trans-tibial amputees do not show major gait differences when walking is executed on various kinds of prosthetic feet.

Original languageEnglish (US)
Pages (from-to)205-215
Number of pages11
JournalProsthetics and Orthotics International
Volume24
Issue number3
DOIs
StatePublished - Jan 1 2000

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