Toward a hybrid exoskeleton for crouch gait in children with cerebral palsy: neuromuscular electrical stimulation for improved knee extension.
Blynn L Shideler, Thomas C Bulea, Ji Chen and 3 others
PMID 32883297WHAT IT FOUND
In one child with cerebral palsy, electrical stimulation to two knee muscles during stance improved knee extension and range of motion in the more affected leg.
This immediate change occurred while wearing an exoskeleton that was not actively assisting movement. It does not prove long-term benefit or that the stimulation alone caused the improvement.
Key findings
01Synchronized electrical stimulation to the vastus lateralis and rectus femoris significantly improved peak knee extension during mid-stance in the left leg compared to baseline exoskeleton walking.
02Total knee excursion in the left leg significantly improved from 41.2° ± 3.9° to 46.4° ± 2.5° when stimulation was applied to both muscles.
03Gait speed did not differ significantly between the exoskeleton conditions with and without electrical stimulation.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
Results are from a single participant, so they cannot be generalized to other children with crouch gait. The exoskeleton provided no active motor assistance during the trials, so the observed changes reflect the effect of stimulation and the device's passive mechanics, not a hybrid powered treatment. The study measured immediate kinematic changes during a single session, not long-term changes in muscle strength, size, or unassisted walking ability. Stimulation timing was based on a simple two-state model, causing delays in onset and offset relative to heel strike and toe-off.
Declared interests
The study was funded by the NIH Clinical Center, and the authors are affiliated with NIH. No other conflicts of interest are reported.
The easy way to misread this
Do not interpret the improved knee angle as evidence that this hybrid exoskeleton and stimulation system is an effective treatment for crouch gait. The result comes from one child in a single session where the exoskeleton was not actively assisting movement, and the authors state the data are too preliminary to draw clinical conclusions.