Comparison of methods for the calculation of energy storage and return in a dynamic elastic response prosthesis

Mark D. Geil, Mohamad Parnianpour, Peter Quesada, Necip Berme, Sheldon Simon

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


The standard method used to calculate the ankle joint power contains deficiencies when applied to dynamic elastic response prosthetic feet. The standard model, using rotational power and inverse dynamics, assumes a fixed joint center and cannot account for energy storage, dissipation, and return. This study compared the standard method with new analysis models. First, assumptions of inverse dynamics were avoided by directly measuring ankle forces and moments. Second, the ankle center of rotation was corrected by including translational power terms. Analysis with below-knee amputees revealed that the conventional method overestimates ankle forces and moments as well as prosthesis energy storage and return. Results for efficiency of energy return were varied. Large differences between models indicate the standard method may have serious inadequacies in the analysis of certain prosthetic feet. This research is the first application of the new models to prosthetic feet, and suggests the need for additional research in gait analysis with energy-storing prostheses. Copyright (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)1745-1750
Number of pages6
JournalJournal of Biomechanics
Issue number12
StatePublished - Dec 2000
Externally publishedYes


  • Amputee
  • Gait
  • Joint power
  • Prosthetics


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