The control of FES-induced ankle dorsiflexion of adults with spastic diplegia using a pulsewidth modulation pattern-a preliminary study

A universal pulsewidth modulation pattern was identified for adults with spastic diplegia in our previous characterisation study. As a preliminary clinical trial, the identified pattern was applied to 5 adults with spastic diplegia in supine position using an open-loop control system to attain and maintain a predetermined ankle dorsiflexion. A high percentage of success in obtaining a prolonged targeted response was demonstrated. This preliminary result suggested that by providing the therapist with a means to control the FES-induced ankle dorsiflexion, a prolonged motor response at desired angle could be achieved even after repeated stimulation.