Correction of Footdrop Due to Multiple Sclerosis Using the STIMuSTEP Implanted Dropped Foot Stimulator

Area of Science:

• Neurology
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Footdrop significantly impairs walking safety and efficiency in multiple sclerosis (MS).
• Functional electrical stimulation (FES) is a viable method for correcting footdrop by inducing dorsiflexion.
• Comparing external and implanted FES devices is crucial for optimizing treatment strategies.

Purpose of the Study:

• To retrospectively analyze clinical data comparing external and implanted FES for footdrop correction in MS.
• To evaluate the long-term efficacy and usability of the STIMuSTEP implanted FES device.

Main Methods:

• Retrospective analysis of clinical data from individuals with MS using FES.
• Assessment of walking performance (10-m walk speed, 3-min walk distance, PCl) and quality of life.
• Comparison of external FES use (≥6 months) versus implanted STIMuSTEP device outcomes.

Main Results:

• Both external and implanted FES significantly improved walking speed and distance.
• A trend towards reduced Physiological Cost Index indicated less walking effort with FES.
• Implanted FES showed improved daily usability (faster application, more frequent use) and maintained walking speed gains at 3 years.
• Device-related quality of life was enhanced with both FES types.

Conclusions:

• The STIMuSTEP implanted foot drop stimulator is an effective long-term solution for footdrop in MS.
• Implanted FES provides sustained functional benefits and improved quality of life compared to external devices.
• While effective, potential complications like implant failure after falls and neuropraxia require consideration.