In vivo measurement of loads and pressures acting on articular cartilage in the knee joint during various activities and rehabilitative therapies following focal defect repair will provide a means of designing activities that encourage faster and more complete healing of focal defects. It was the goal of this study to develop a totally portable monitoring system that could be used during various activities and allow continuous monitoring of forces acting on the knee. In order to make the monitoring system portable, a handheld computer with custom software, a USB powered miniature wireless receiver, and a battery-powered coil were developed to replace a currently used computer, ac powered benchtop receiver, and power supply. A Dell handheld running Windows Mobile operating system programed using LABVIEW was used to collect strain measurements. Measurements collected by the handheld-based system connected to the miniature wireless receiver were compared with the measurements collected by a hardwired system and a computer based system during benchtop testing and in vivo testing. The newly developed handheld-based system had a maximum accuracy of 99% when compared to the computer based system.
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September 2008
Design Innovations
A Handheld Computer as Part of a Portable In Vivo Knee Joint Load-Monitoring System
J. A. Szivek,
J. A. Szivek
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery and Arizona Arthritis Center,
University of Arizona
, Tucson, AZ 85724
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V. S. Nandakumar,
V. S. Nandakumar
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery and Arizona Arthritis Center,
University of Arizona
, Tucson, AZ 85724
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C. P. Geffre,
C. P. Geffre
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery and Arizona Arthritis Center,
University of Arizona
, Tucson, AZ 85724
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C. P. Townsend
C. P. Townsend
MicroStrain Inc.
, 310 Hurricane Lane, Suite 4, Williston, VT 05495
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J. A. Szivek
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery and Arizona Arthritis Center,
University of Arizona
, Tucson, AZ 85724
V. S. Nandakumar
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery and Arizona Arthritis Center,
University of Arizona
, Tucson, AZ 85724
C. P. Geffre
Orthopaedic Research Laboratory, Department of Orthopaedic Surgery and Arizona Arthritis Center,
University of Arizona
, Tucson, AZ 85724
C. P. Townsend
MicroStrain Inc.
, 310 Hurricane Lane, Suite 4, Williston, VT 05495J. Med. Devices. Sep 2008, 2(3): 035001 (9 pages)
Published Online: August 6, 2008
Article history
Received:
June 24, 2007
Revised:
February 14, 2008
Published:
August 6, 2008
Citation
Szivek, J. A., Nandakumar, V. S., Geffre, C. P., and Townsend, C. P. (August 6, 2008). "A Handheld Computer as Part of a Portable In Vivo Knee Joint Load-Monitoring System." ASME. J. Med. Devices. September 2008; 2(3): 035001. https://doi.org/10.1115/1.2952815
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