In Vitro Evaluation of an Implantable Force Transducer (IFT) in a Patellar Tendon Model

[+] Author and Article Information
D. L. Glos, D. L. Butler, E. S. Grood, M. S. Levy

Noyes-Giannestras Biomechanics Laboratory, Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, OH 45221-0048; Department of Quantitative Analysis, University of Cincinnati, Cincinnati, OH 45221-0130

J Biomech Eng 115(4A), 335-343 (Nov 01, 1993) (9 pages) doi:10.1115/1.2895495 History: Received October 01, 1991; Revised December 21, 1992; Online March 17, 2008


A new implantable transducer has been developed for in situ evaluation of ligament and tendon forces. Unlike previous devices, this sensor is placed within the specimen, minimizing measurement errors due to impingement on surrounding soft tissues and bone. In this study, we present the sensor design details as well as test results from initial in vitro trials in the goat patellar tendon model. Device performance and influence of the device on the specimen were evaluated under several loading conditions. In all cases, device output had a strong correlation with induced tissue load. Significant variations in device performance were only noted at high tissue deformation rates. More extensive investigations will be conducted to assess how changes in transducer design might alter performance characteristics.

Copyright © 1993 by The American Society of Mechanical Engineers
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