Phase I design and evaluation of an isometric muscle reeducation device for knee osteoarthritis rehabilitation.
Our long-term goal is to improve adherence to a home-based isometric program for rehabilitation of knee osteoarthritis (OA) using a force-biofeedback device (Isopad). Our goal for Phase I was to design and evaluate an Isopad-based program in a supervised clinical setting. Our subjects were five patients with knee OA of Kellgren stage II or greater. A capacitive force sensor was tested for accuracy, repeatability, and durability. An Arthritis Foundation home-based isometric program inspired the Isopad design. The Isopad provided visual and auditory feedback instantaneously and continuously about force generated between the ankles. The five subjects completed a supervised 8-week progressive isometric program using the Isopad. Absolute isolated quadriceps and hamstring torques were quantified with a dynamometer, and patients completed a self-assessment of symptoms (Western Ontario and McMaster Universities Osteoarthritis Index). The capacitive sensor accuracy error averaged 10% and repeatability 4%. Cognitively intact subjects used the Isopad successfully for isometric progressive resistance training. Quadriceps and hamstrings absolute torques increased an average of 30%. Patients reported decreased functional complaints (Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index). All changes were trends. The Isopad helped subjects with knee OA adhere to a supervised isometric program and meet progressive strength targets. The next-generation Isopad will be employed in a home-based program.
Goldman
Robert J
RJ
SensorPad Systems, Inc., Norristown, PA, USA. rgold527w@aol.com
Reinbold
Kirk A
KA
Iglarsh
Z Annette
ZA
Neustadter
Lawrence M
LM
Oatis
Carol A
CA
Schumacher
H Ralph
HR
D004576:Electromyography; D005081:Exercise Therapy / Q000295:instrumentation* / Q000379:methods; D005246:Feedback; D006801:Humans; D020370:Osteoarthritis, Knee / Q000534:rehabilitation*; D010349:Patient Compliance