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Development of an electrogoniometer wrist platform to remove measurement error.

Spielholz-PO; Hughes-R
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :14
Electrogoniometers represent one of the few feasible methods of measuring wrist motion on a person while he or she is moving and performing work. However, there have been questions as to the accuracy of angle readings due to crosstalk introduced by forearm rotation. A forearm rotation correction procedure was previously developed that resulted in reducing mean flexion/extension error from 7.06 degrees to 4.79 degrees and radial/ulnar deviation error from 10.56 degrees to 4.73 degrees. However, correcting for forearm rotation necessitates the use of an electrotorsiometer in conjunction with the electrogoniometer. A wrist platform was developed for the electrogoniometer, which may remove significant forearm rotation crosstalk from wrist angle channels. A wrist-cuff was made from thermoplast splinting material with an angled platform attached to the superior surface. The distal end of the electrogoniometer was taped to the top of the hand, while the proximal end was taped to the platform. In theory, the wrist platform would then allow the electrogoniometer to rotate with the hand instead of becoming twisted, as happens during standard application. A jig was also developed for calibrating actual wrist and forearm rotation angles to those measured by the goniometers. In a pilot study using a limited range of motion, the wrist platform was compared with a standard application. Results showed that forearm rotation was removed as a significant factor for flexion/extension. Forearm rotation remained a significant factor for ulnar/radial deviation measurement, but removed only 0.25 degrees of additional error. Mean error using the platform was 2.39 degrees for flexion/extension and 2.38 degrees for radial/ulnar deviation. These results show that this easily made device may have useful application in the measurement of wrist motions in laboratory studies or tasks with limited ranges of motion such as key-boarding.
Ergonomics; Measurement-equipment; Analytical-instruments; Humans; Task-performance; Motion-studies; Biomechanics; Arm-injuries; Electrical-measurement; Electrical-measurement-devices; Extremities; Physiological-measurements; Body-regions
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American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia