Effects of a simple functional electric system and/or a hinged ankle-foot orthosis on walking in persons with incomplete spinal cord injury

Abstract 

Kim CM, Eng JJ, Whittaker MW. Effects of a simple functional electric system and/or a hinged ankle-foot orthosis on walking in persons with incomplete spinal cord injury.Arch Phys Med Rehabil 2004;85:1718–23.

Objectives

To compare the effect of functional electric stimulation (FES) with that of a hinged ankle-foot orthosis (AFO) for assisting foot clearance, gait speed, and endurance and to determine whether there is added benefit in using FES in conjunction with the hinged AFO in persons with incomplete spinal cord injury (SCI).

Design

Within-subject comparison of walking under 4 conditions: AFO, FES, AFO and FES, and no orthosis. A plastic hinged AFO was used for all AFO conditions.

Setting

Tertiary rehabilitation center.

Participants

Nineteen subjects with incomplete SCI.

Interventions

Not applicable.

Main outcome measures

The self-selected gait speed, 6-minute walk distance, and foot clearance values were compared between conditions.

Results

Gait speed increased with FES (P<.05) and with the AFO (P=.06). Six-minute walk distance also increased with the AFO (P<.05). No difference was found between the 2 forms of orthoses in either gait speed or endurance. The greatest increase in gait speed and endurance from the no-orthosis condition occurred with the combined AFO and FES condition. Foot clearance improved with FES but not with AFO. Subjects whose gait speed increased with FES had weaker hip flexors, knee flexors, and ankle dorsiflexors than those who did not benefit from FES.

Conclusions

Both FES and the hinged AFO promote walking and FES is only superior to the AFO in increasing foot-clearance values. The hinged AFO and FES together may offer advantages over either device alone.

Key words:  Electric stimulation , Orthotic devices , Rehabilitation , Spinal cord injuries , Walking