Electrodes partially restore movement and sensation in spinal cord patients

Researchers implanted electrodes above and below spinal cord injuries in three patients; stimulation below the lesion partially restored leg muscle control while stimulation above produced substitute sensations in other body areas that participants learned to interpret as leg position.

Researchers report coordinated electrical stimulation above and below spinal cord injuries produced partial restoration of movement and sensory cues in three people with complete lower‑limb paralysis. The study, published in Nature Biomedical Engineering, tested implanted electrodes and an interface that let participants adjust stimulation patterns. Stimulation below the injury activated leg muscles, while stimulation above the injury produced sensations in other body regions that participants learned to associate with leg position. The team combined participant‑guided tuning with machine learning to refine stimulation patterns. Key findings: - Electrodes were implanted both above and below the site of spinal cord damage in three patients with complete loss of leg use. - Stimulation below the injury partially restored muscle control needed for walking movements. - Stimulation above the injury produced substitute sensations felt in other parts of the body, which participants could learn to interpret as leg position. - Participants used a DJ‑style control board to adjust stimulation and provided data used to train an AI to optimize patterns. - In treadmill tests with a ceiling harness, participants activated walking muscles and could report foot‑strike timing using the substitute sensations. Summary: The results show simultaneous motor stimulation and sensory replacement can provide coordinated signals across a spinal lesion and offer a potential path toward more functional movement. The researchers plan to recruit more patients for a longer‑term study outside the hospital and to explore whether coordinated stimulation can support rehabilitation over time.