A Six-Degree-of-Freedom Test System for the Study of Joint Mechanics and Ligament Forces

[+] Author and Article Information
J. M. Hollis

Orthopaedic Biomechanics Laboratory, University of Arkansas for Medical Sciences, MS 531, 4301 West Markham St., Little Rock, AR 72205

J Biomech Eng 117(4), 383-389 (Nov 01, 1995) (7 pages) doi:10.1115/1.2794196 History: Received June 19, 1994; Revised October 19, 1994; Online October 30, 2007


A joint testing system was designed to transmit a specified motion or force to a joint in all six degrees of freedom (d.o.f.) using a spatial linkage system for position feedback. The precise reproducibility of position provided by this method of position feedback allows determination of in situ ligament forces for external joint loadings. Load on the structure of interest is calculated from six d.o.f. load cell output after the loaded position is reproduced with all other structures removed. In a test of this system, measured loads showed good agreement with applied loads.

Copyright © 1995 by The American Society of Mechanical Engineers
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