Position versus force control: using the 2-DOF robotic ankle trainer to assess ankle's motor control

Area of Science:

• Rehabilitation Engineering
• Biomechanics
• Neurorehabilitation

Background:

• Ankle sprains affect millions annually, leading to significant disabilities.
• Neurological conditions like stroke and cerebral palsy often cause ankle impairments.
• Robotic rehabilitation offers a promising avenue for improving ankle function and balance.

Purpose of the Study:

• To introduce and evaluate the virtually interfaced robotic ankle and balance trainer (vi-RABT) system.
• To assess the effectiveness of vi-RABT in improving ankle strength, flexibility, and motor control.
• To compare subject control over ankle position versus force during interactive rehabilitation tasks.

Main Methods:

• The vi-RABT system, featuring 2 degrees of freedom (2-DOF) actuation and comprehensive measurement capabilities, was utilized.
• Healthy human subjects participated in rehabilitation exercises using the vi-RABT platform integrated with virtual reality games.
• Ankle strength, flexibility, and motor control were assessed through objective measurements during the tasks.

Main Results:

• The vi-RABT system demonstrated potential as a cost-effective rehabilitation tool.
• Subjects exhibited enhanced control over ankle position compared to force control in the 2-DOF tasks.
• The study provides insights into the efficacy of robotic-assisted balance and ankle training.

Conclusions:

• The vi-RABT system is a viable platform for assessing and improving ankle function.
• Robotic-assisted rehabilitation, particularly with virtual reality integration, shows promise for neurological recovery.
• Future research should explore vi-RABT's application in patient populations with ankle impairments.