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functional electrical stimulation (FES)
Home > Cerebral Palsy > Cerebral Palsy Treatment > Functional Electrical Stimulation
Last Updated: April 29, 2022

Functional Electrical Stimulation

Page Medically Reviewed and Edited by Gina Jansheski, M.D.
Page Medically Reviewed and Edited by Gina Jansheski, M.D.

This article has been fact checked by a Board Certified Pediatrician. Sources of information for the article are listed at the bottom.

For any content issues please Contact Us.

A technology originally developed to help people with paralysis, functional electrical stimulation (FES) is now being used to treat many medical conditions, including cerebral palsy. FES is being tested in clinical trials for conditions ranging from stroke to multiple sclerosis and cerebral palsy. In children with CP, the treatment has been found to improve range of motion, muscle mass, muscle strength, walking speed, spasticity, gait, and foot and ankle positioning.

What Is Functional Electrical Stimulation?

FES is a fairly simple technology. It can be done with a small device that delivers an electrical impulse to a muscle. It is a low-energy current that acts like a tiny shock to activate nerves, which in turn causes the muscle to move.[1]

This can be used for a paralyzed muscle that the person cannot normally move. Because the electrical energy delivered is low, the procedure is safe and not expected to be painful. The person receiving the impulse may feel a minor tingling or, at worst, a slight burning sensation.

Traditionally, FES technology has been developed and used for people who suffer paralysis from accidents. The stimulation can assist a person with small-scale muscle movements like voiding the bladder and swallowing, as well as with larger movements like walking, grasping objects, or standing up.

FES has also been used in people recovering from a stroke who have lost some muscle function and those with neurological disorders or brain damage.

This therapy is described as functional because it restores function but also because it is not designed to be a lifelong mobility aid. It is only intended to be used as a short-term therapeutic modality to retrain muscles and restore some degree of voluntary muscle function.

The technology is being developed further, though, with some paralyzed patients benefiting from implanted electrical stimulation devices that allow them to regain some muscle movement.

Improving Gait in Spastic Cerebral Palsy

Spastic cerebral palsy is the most common form of this condition, describing between 70 and 80 percent of all children with CP.[2] It causes the muscles to be stiff and painful and the reflexes to be exaggerated. Most children with this form of CP will struggle to walk to some degree. They may also experience involuntary limb movement, continuous muscle spasms, joint contractures, and limited flexibility.

Studies show that FES can be used to help children with spastic cerebral palsy walk better and more easily. In one such study, the children received eight weeks of daily functional electrical stimulation to the muscles. The study involved 32 children with an average age of 10 years.[3] There was a control group along with the group that received the FES treatment.

All of the children were evaluated at the beginning of the study, again at the end of the eight weeks of treatment, and six weeks after that. They were assessed for their walking ability and their own perceptions of how they were walking.

Those who received the treatment showed significant improvements in how they perceived their ability to walk. These children felt that they could walk better and with less pain.

In another study involving children with hemiplegic spastic cerebral palsy, FES treatment was shown to improve gait abnormalities.[4] Hemiplegic CP occurs when the disability is only on one side of the body, left or right. This can cause the child to toe-walk and have other asymmetrical gait issues that disturb the child’s balance.

Over time, these often cause more challenges with flexibility, coordination, pain, and movement.

The children in this study could walk, but many used braces. They received FES instead of braces or splints. The children were evaluated before and after the treatment, and there were significant improvements in toe-walking and other asymmetries. All of the children were able to move more symmetrically due to the treatment.

These studies are more examples of research demonstrating similar improvements for children with spastic cerebral palsy treated with FES.

Correcting Foot Drop

Some children with cerebral palsy develop a type of movement called foot drop. They have difficulty picking up their feet to take steps, and the toe tends to drag while they move through each step. To avoid this, they lift the knee higher or swing it outward to help elevate the foot off the ground while walking.

It is an awkward movement to keep the foot from dragging, and it can cause pain and other issues later on. Foot drop is most often corrected with braces or orthotics, but these can limit a child’s movement.

A study that used FES to treat foot drop in children with cerebral palsy showed promising results. A group of children used an FES device for four months, and their gaits were evaluated periodically.

While none saw increased walking speed, they did have improved flexion in the ankle and foot with reduced awkward movements to avoid dragging the toes.

Clinical Trials Ongoing for Children with Cerebral Palsy

While the studies using FES to help children with cerebral palsy are coming up with positive results, it is not yet accepted as a standard treatment. One way that a child can benefit from this therapy is to get involved in clinical trials.

These are usually government-funded and involve actual patients testing the safety and effectiveness of treatments not yet approved for general use. You can talk to your child’s doctor or search online to find out more about ongoing clinical trials for FES and cerebral palsy recruiting patients.

Functional electrical stimulation shows excellent promise for giving some children back a degree of movement free from awkwardness and pain. While the treatment is not widely available, its apparent effectiveness and safety mean its use will likely become more widespread.

FES has already helped a significant number of people with other conditions, including stroke and paralysis, and it may be only a matter of time before its use is expanded to include more children with cerebral palsy.

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References

  1. Functional electrical stimulation (FES) for children and young people with cerebral palsy. (n.d.). ScienceDirect.com | Science, health and medical journals, full text articles and books.
    Retrieved from: https://www.sciencedirect.com/science/article/abs/pii/S1751722219301763
  2. What is Cerebral Palsy? (2019, September 11). Centers for Disease Control and Prevention.
    Retrieved from: https://www.cdc.gov/ncbddd/cp/facts.html
  3. Daily functional electrical stimulation during everyday walking activities improves performance and satisfaction in children with unilateral spastic cerebral palsy: a randomized controlled trial. (n.d.). Archives of Physiotherapy.
    Retrieved from: https://archivesphysiotherapy.biomedcentral.com/articles/10.1186/s40945-015-0005-x
  4. PROSSER, L. A., CURATALO, L. A., ALTER, K. E., & DAMIANO, D. L. (2012). Acceptability and potential effectiveness of a foot drop stimulator in children and adolescents with cerebral palsy. Developmental Medicine & Child Neurology, 54(11), 1044-1049.
    Retrieved from: https://doi.org/10.1111/j.1469-8749.2012.04401.x
View All References
Page Medically Reviewed and Edited by Gina Jansheski, M.D.

Page Medically Reviewed and Edited by Gina Jansheski, M.D.

Gina Jansheski, M.D. is a Board Certified Pediatrician and a Fellow of the American Academy of Pediatrics. She has been a practicing pediatrician for over 20 years, working primarily with hospitalized patients and children with special needs.

See Full Bio

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