Enclosed electronic system for force measurements in knee implants.
File(s)
Author(s)
Type
Journal Article
Abstract
Total knee arthroplasty is a widely performed surgical technique. Soft tissue force balancing during the operation relies strongly on the experience of the surgeon in equilibrating tension in the collateral ligaments. Little information on the forces in the implanted prosthesis is available during surgery and post-operative treatment. This paper presents the design, fabrication and testing of an instrumented insert performing force measurements in a knee prosthesis. The insert contains a closed structure composed of printed circuit boards and incorporates a microfabricated polyimide thin-film piezoresistive strain sensor for each condylar compartment. The sensor is tested in a mechanical knee simulator that mimics in-vivo conditions. For characterization purposes, static and dynamic load patterns are applied to the instrumented insert. Results show that the sensors are able to measure forces up to 1.5 times body weight with a sensitivity fitting the requirements for the proposed use. Dynamic testing of the insert shows a good tracking of slow and fast changing forces in the knee prosthesis by the sensors.
Date Issued
2014-08-31
Start Page
15009
End Page
15021
Journal / Book Title
Sensors (Basel)
Volume
14
Issue
8
Copyright Statement
© 2014 by the authors; licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
http://www.ncbi.nlm.nih.gov/pubmed/25196007
s140815009
Subjects
Arthroplasty, Replacement, Knee
Biomechanical Phenomena
Equipment Design
Knee Prosthesis
Surgery, Computer-Assisted
Weight-Bearing
Knee Joint
Humans
Analytical Chemistry
Publication Status
Published
Coverage Spatial
Switzerland