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The Journal of Bone and Joint Surgery (American) 83:S62-66 (2001)
© 2001 The Journal of Bone and Joint Surgery, Inc.

Scientific Article

e-Knee: Evolution of the Electronic Knee Prosthesis

Telemetry Technology Development

Beverly A. Morris, MBA, RN, Darryl D. D'Lima, MD, John Slamin, Neb Kovacevic, Steven W. Arms, Christopher P. Townsend and Clifford W. Colwell, Jr., MD

Beverly A. Morris, MBA, RN
The Morris Agency, 12165 Iron View Row, San Diego, CA 92128. E-mail address: deters@aol.com

Darryl D. D’Lima, MD
Clifford W. Colwell Jr., MD
The Center for Orthopaedic Research and Education, Scripps Clinic, 11025 North Torrey Pines Road, Suite 140, La Jolla, CA 92037

John Slamin
DePuy Johnson and Johnson, 325 Paramount Drive, Raynham, MA 02767

Neb Kovacevic
NK Biotechnical Corporation, P.O. Box 26335, Minneapolis, MN 55426

Steven W. Arms
Christopher P. Townsend
MicroStrain, Incorporated, 294 North Winooski Avenue, Burlington, VT 05401

In support of their research or preparation of this manuscript, one or more of the authors received grants or outside funding from The Dr. Scholl Foundation. In addition, one or more of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity (MicroStrain, Incorporated). No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

The first 150 words of the full text of this article appear below.


   Purpose
 
Our purpose was to develop a fully instrumented tibial component of a total knee prosthesis (Fig. 1) containing multichannel transducers (load cells), a microtransmitter, and an antenna. Three complex technologies were incorporated into a prosthesis capable of measuring in vivo tibiofemoral compressive forces to transmit "real-time" data. The geometry was modified to accommodate the transducer and electronic technologies (Fig. 2).


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  		Fig. 1: Photograph of instrumented prototype and polyethylene insert.

 

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  		Fig. 2: Schematic of the e-Knee, a total knee prosthesis containing transducers (load cells), a transmitter, and an antenna.

 
As a result of the development of a fully instrumented implant, direct load measurements were recorded intraoperatively during the course of a total knee replacement. Long-term collection of in vivo measurements of loads on a total knee prosthesis will allow future improvements in knee-replacement design, rehabilitation, and assistive devices such as lower-extremity braces, orthotics, and shoes. This report describes the history and . . . [Full Text of this Article]


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