D1: Orthopaedic Biomechanics I


Fong-Chin Su

National Cheng Kung University, Taiwan

The hand receives sensory stimuli and executes motor commands that are integrated in the various functional manipulations for daily tasks. Awkward and inefficient finger movements, poor force coordination and strength, sensation deficit of motor control of the affected hands are most common phenomena in patients. We developed the instruments for quantitative measurement of force coordination and sensation of the digits in performing daily activities including pinch holding and grasping. The customdesign simulator with five force transducers which position can be adjusted to record the applied force in natural grasping configuration was applied for understanding of the patients with trigger finger and carpal tunnel syndrome, respectively. As for the patients with carpal tunnel syndrome, they grasped with greater digit force associated with weaker pairdigit correlation and higher force variability on specific digits in different task demands. Also, the customdesigned computerized evaluation and re-education biofeedback prototype was developed to analyze hand grasp performances, and monitor the training effects on hand coordination for stroke patients with sensory disturbance and without motor deficiency. The biofeedback procedures provide visual and auditory cues to the participants when the interactive force of hand-to-object exceeded the target latitude in a pinchup-holding task to trigger optimal motor strategy. The sensation, force coordination, and biofeedback reeducation for the patients with sensory deficits will be presented from biomechanical aspects.

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