Two of the four participants (both AIS grade B) were able to walk over ground with assistive devices after intensive physical training with electrical stimulation of the lower spinal cord. The other two (both AIS grade A) achieved some components of independent stepping on the treadmill with body-weight support but not over-ground walking. All four participants could not do these actions in trials when the stimulator was off.
NEJM – Error
The New England Journal of Medicine