Amputee Independent Prosthesis Properties-A new model for description and measurement

Matthew J. Major*, Martin Twiste, Laurence P.J. Kenney, David Howard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


A model is presented for describing the Amputee Independent Prosthesis Properties (AIPP) of complete assemblies of trans-tibial prosthetic components distal to the socket. This new AIPP model includes features of both lumped parameter and roll-over models and describes prosthesis properties that are of importance in stance phase, including prosthetic foot geometry, normal stiffness, shear stiffness, and damping (energy dissipation). Methods are described for measuring the parameters of the AIPP model using a custom test-rig, commercial load-cell, and a motion capture system. Example data are presented for five pylon angles reflecting the shank angles seen in normal gait. Through the inclusion of measured AIPP in future in-vivo studies comparing different prostheses more generic information, as opposed to product specific claims, will become more widely available to inform future designs, prescription, and alignment procedures.

Original languageEnglish (US)
Pages (from-to)2572-2575
Number of pages4
JournalJournal of Biomechanics
Issue number14
StatePublished - Sep 23 2011


  • Amputee
  • Mechanical properties
  • Prosthesis
  • Trans-tibial

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation


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