Emerging Modalities in Spinal Cord Rehabilitation

Spinal cord injury (SCI) remains among the most devastating neurological conditions, with few effective restorative options on the horizon. Neuromodulation, particularly multimodal neuromodulation, which integrates electrical, magnetic, and sensory stimulation techniques, holds growing promise, and there is increasing evidence to suggest that this technique promotes neuroregeneration and neural repair by regulating neuronal and neural network activities.[1,2] Neuromodulation, however, remains an emerging field, and considerable validation is required prior to establishing its efficacy. The article by Zhang et al. captures the essence of this evolving technique and is a significant value addition to available literature on this topic.[3] Transcranial magnetic stimulation (TMS), transcranial direct current stimulation (tDCS), and brain–computer interface techniques are almost considered standard of care in CNS rehabilitation. Neuromodulation, with regard to spinal cord rehabilitation, encompasses a range of techniques, including spinal cord stimulation, peripheral nerve stimulation, and functional electrical stimulation. Spinal cord stimulation (SCS) uses electrical impulses to modulate spinal neural circuits, promote neural plasticity, activate residual neural pathways, and thereby contribute to the recovery of motor and autonomic functions following SCI. Combining modalities such as SCS with transcranial magnetic stimulation or brain–computer interface systems augments the effectiveness. Peripheral nerve stimulation (PNS) targets peripheral nerves to inhibit pain transmission through the gate control mechanism, thereby alleviating pain and enhance plasticity. Functional electrical stimulation (FES) directly activates muscles or motor neurons to generate functional movements, effectively bypassing damaged central nervous system pathways. These integrated approaches are designed to engage the nervous system across multiple levels by strengthening descending motor commands, optimizing spinal circuit responsiveness, and improving sensory feedback. The core principals of neuroplasticity and rehabilitation thus include repetition, task specificity, sufficient intensity, and functional relevance. To enhance therapeutic efficacy, neuromodulation can be combined with conventional rehabilitation training, stem cell therapy, and pharmacological treatments to provide synergistic neuroprotective effects. When combined with nerve regeneration and remodeling strategies like stem cell therapies and biomaterial scaffold, multimodal interventions integrating electrical, magnetic, optical, and chemical stimulation may enable more precise and effective neuromodulation. Growing evidence from both clinical and preclinical studies indicates that combined neuromodulation approaches can produce outcomes superior to those achieved with single modalities. For instance, integrating SCS with intensive locomotor training strengthens sensorimotor integration and accelerates gait recovery in individuals with incomplete SCI. Likewise, the combination of central (cortical) and peripheral stimulation has been shown to enhance corticospinal connectivity more effectively than isolated interventions. Neuromodulation, however, needs to overcome several challenges before it can be considered standard of care. These include the risk of infection associated with implanted devices, the need for personalized treatment protocols, biocompatibility concerns, ethical considerations, requirements for device miniaturization and improved power supply solutions, and inconsistent outcomes due to highly variable patient responses. Future therapeutic strategies like AI-driven personalization, rehabilitation, and biofeedback, supported by cross-disciplinary collaboration, may help to resolve these challenges. The development of wearable and portable stimulation technologies will also extend therapy into home environments. Multimodal neuromodulation represents a comprehensive and synergistic approach to SCI rehabilitation and is increasingly viewed as the future of SCI management. Collaborative translational frameworks that bring together clinicians and engineers will ensure refinement of stimulation protocols and rapid translation of these techniques into clinical practice. Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.