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Prosthet Orthot Int. 2017 Aug;41(4):402-411. doi: 10.1177/0309364616652017. Epub 2016 Jul 18.

A method for performance comparison of polycentric knees and its application to the design of a knee for developing countries.

Author information

1
Indian Institute of Technology Madras, Chennai, India.

Abstract

BACKGROUND:

Polycentric knees for transfemoral prostheses have a variety of geometries, but a survey of literature shows that there are few ways of comparing their performance.

OBJECTIVES:

Our objective was to present a method for performance comparison of polycentric knee geometries and design a new geometry.

STUDY DESIGN:

In this work, we define parameters to compare various commercially available prosthetic knees in terms of their stability, toe clearance, maximum flexion, and so on and optimize the parameters to obtain a new knee design.

METHODS:

We use the defined parameters and optimization to design a new knee geometry that provides the greater stability and toe clearance necessary to navigate uneven terrain which is typically encountered in developing countries.

RESULTS:

Several commercial knees were compared based on the defined parameters to determine their suitability for uneven terrain. A new knee was designed based on optimization of these parameters. Preliminary user testing indicates that the new knee is very stable and easy to use.

CONCLUSION:

The methodology can be used for better knee selection and design of more customized knee geometries. Clinical relevance The method provides a tool to aid in the selection and design of polycentric knees for transfemoral prostheses.

KEYWORDS:

Biomechanics; biomechanics of prosthetic/orthotic devices; developing countries; four-bar knee; polycentric knee; prosthetic design; prosthetics; prosthetics and orthotics in developing countries; toe clearance; uneven terrain

PMID:
27435740
DOI:
10.1177/0309364616652017
[Indexed for MEDLINE]

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