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Device used to measure motion of the upper extremity
Block diagram of path of electrogoniometric system
Schematic of analog portion of electrogoniometer
20 other sections not shown
17 seconds accuracy acquisition rate aDout analog signal analyzed data angle and trajectory angle data angle plot angular anqle arm motion attachment average percent difference axis cadaver arm calculated calibration equations calibration factor calibration method coefficient of variance computer memory delay value determined Detween device placement digital data distance elbow angle elbow joint elDow extended finger joint fingertip with respect flexion flexion/extension horizontal movement humerus hysteresis I I I I inches joint angle joint motion kinematic lateral epicondyle law of cosines linear calibration linkage lengths linkage system lookup plastic goniometer position programs protractor READING repeataDility reverse analysis rotation matrix sagittal plane segment shoulder and elbow shoulder coordinate system shown in Figure slope sources of error standard deviation subroutine suDject Table TaDle trajectory data trajectory plot trochlea TSX-plus upper extremity Velcro Velcro strap vertical deviation voltage X-ray and potentiometer X-ray angle X-ray source Y-intercept