Isometric Quadriceps Strength Test Device to Improve the Reliability of Handheld Dynamometry in Patient With Anterior Cruciate Ligament Injury PUBLIC ACCESS

[+] Author Affiliations
Stephanie McNamara, Elizabeth Gallardo Hevia, Reggie St. Louis, William Cho

Harvard University, Cambridge, MA

Sangjun Lee, Martina Moyne, Brendan Quinlivan, Christopher J. Payne, Conor Walsh

Wyss Institute for Biologically Inspired Engineering, Boston, MA

Greg Schiller, Louis N. Awad

Boston University, Boston, MA

Paper No. DMD2018-6848, pp. V001T09A001; 4 pages
  • 2018 Design of Medical Devices Conference
  • 2018 Design of Medical Devices Conference
  • Minneapolis, Minnesota, USA, April 9–12, 2018
  • ISBN: 978-0-7918-4078-8
  • Copyright © 2018 by ASME


Anterior cruciate ligaments (ACL) injuries account for a significant proportion of all sports-related injuries. Despite successful completion of a rehabilitation program, about 35% of ACL patients experience re-injury after return to sport, and studies have identified persistent quadriceps strength deficits as a potential cause [1–3]. Deficits in quadriceps strength can be monitored throughout rehabilitation using muscle strength testing. The most common test protocol involves isometric testing of quadriceps strength whereby the knee is extended against a static resistance. In this method, the clinician uses their strength to resist the patient’s motion and subsequently assigns a qualitative value of strength. The highly subjective nature of this test has motivated clinicians to use devices that can more accurately assess quadriceps strength.

Copyright © 2018 by ASME
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