Transcutaneous spinal cord stimulation combined with robot-assisted gait training to improve mobility and balance in spinal cord injury: intramuscular electromyography as a biomarker for functional recovery.

Spinal cord stimulation delivered through the skin is being explored as a way to boost recovery after incomplete spinal cord injury, but it is unclear whether pairing it with intensive robotic gait training adds anything beyond combining it with standard physical therapy. This trial randomised 20 adults to receive the same dose of stimulation alongside either robot-assisted gait training or conventional therapy, over 8 weeks of frequent sessions. The robot-assisted group showed significantly larger improvements in balance, timed mobility, a walking ability scale, and muscle strength scores, along with greater electrical activity in key leg muscles during stimulation. However, walking speed improved similarly in both groups, with no statistically significant difference detected there.

The trial was small, with an uneven split between groups, which limits how confidently these results can be generalised, and the findings point toward state-dependent neuromodulation as a plausible mechanism rather than a settled explanation.

If you or someone you know is living with an incomplete spinal cord injury, you may have heard about combining electrical spinal stimulation with gait training robots to help with walking and balance. This study looked at whether adding robot-assisted stepping to spinal stimulation worked better than combining the same stimulation with standard physical therapy, in a small group of 20 adults over 8 weeks. The people who got robotic stepping alongside stimulation showed bigger improvements in balance, in how quickly they could get up and walk a short distance, and in a walking ability score, along with more muscle activity in their legs during testing.

Interestingly, how fast people could actually walk a set distance improved about the same in both groups, so the robotic approach did not clearly beat standard therapy on that measure. Because this was a small trial with an uneven number of people in each group, these results give an early signal rather than a final answer about which approach works better.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This trial addresses whether pairing transcutaneous spinal cord stimulation with high-dose robot-assisted gait training (RAGT) offers advantages over pairing the same stimulation with conventional physical therapy (CPT) in people with incomplete spinal cord injury (AIS B-D), a question relevant when deciding how to structure stimulation-based protocols within limited therapy time. Both groups received 40 sessions over 8 weeks including 20 minutes of identical stimulation parameters, with the RAGT group (n=13) showing significantly greater between-group gains in Berg Balance Scale, Timed Up and Go, Walking Index for SCI II, and ASIA motor score compared to the CPT group (n=7), alongside higher intramuscular EMG activation in tibialis anterior, vastus lateralis, and gastrocnemius medialis. These findings suggest that task-specific, robot-guided stepping may enhance the neuromuscular response to spinal stimulation beyond what conventional therapy achieves for these outcomes, informing clinical reasoning about pairing neuromodulation with guided stepping rather than establishing a definitive practice change.

Notably, 10-meter walk test speed improved comparably in both arms with no statistically significant difference, so the robotic add-on did not demonstrate a clear advantage for gait speed specifically, and the authors suggest additional overground practice may be needed to differentiate modalities there. The unequal group sizes (13 versus 7) and overall small sample limit precision and generalisability, and the abstract does not report adverse events, so no safety conclusions can be drawn from this data.