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Related Concept Videos

Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...

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Related Experiment Video

Updated: Jul 23, 2026

A Contusive Model of Unilateral Cervical Spinal Cord Injury Using the Infinite Horizon Impactor
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Spinal cord associative plasticity improves forelimb sensorimotor function after cervical injury.

Ajay Pal1, HongGeun Park1, Aditya Ramamurthy1

  • 1Department of Orthopedics, Columbia University, New York, NY 10032, USA.

Brain : a Journal of Neurology
|September 5, 2022
PubMed
Summary

This study introduces spinal cord associative plasticity, a novel method to enhance sensorimotor connections and improve dexterity after spinal cord injury. This technique shows promise for therapeutic applications in humans with sensorimotor disorders.

Keywords:
electrical stimulationinjurymotor cortexplasticityspinal cord

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Area of Science:

  • Neuroscience
  • Spinal Cord Injury Research
  • Rehabilitation Science

Background:

  • Previous attempts to induce associative plasticity primarily targeted the cortex, yielding inconsistent results.
  • Targeted circuits in prior studies were often inferred rather than directly investigated.
  • A significant gap exists in directly targeting sensorimotor integration within the spinal cord for plasticity induction.

Purpose of the Study:

  • To develop and test a novel method, spinal cord associative plasticity (SCAP), for strengthening sensorimotor connections in the spinal cord.
  • To investigate the physiological effects, mediating pathways, and functional recovery potential of SCAP after spinal cord injury.
  • To determine if SCAP can improve forelimb function and sensorimotor integration in a preclinical model of spinal cord injury.

Main Methods:

  • Developed SCAP by precisely timing motor cortex and dorsal spinal cord stimulations to leverage natural sensorimotor convergence.
  • Investigated the necessity of cortical descending motor and spinal proprioceptive afferents for the SCAP effect.
  • Administered daily SCAP sessions to rats with moderate cervical spinal cord injury and assessed functional recovery, sensorimotor responses, and reflex modulation.

Main Results:

  • Synchronous pairing of motor cortex and spinal cord stimulation significantly augmented muscle potentials, demonstrating SCAP's efficacy.
  • The SCAP effect was dependent on both descending motor and ascending proprioceptive pathways, confirming targeted sensorimotor interaction.
  • SCAP treatment in injured rats led to significant improvements in forelimb dexterity and normalized H-reflex modulation compared to sham controls.

Conclusions:

  • Spinal cord associative plasticity effectively strengthens sensorimotor connections within the spinal cord.
  • SCAP promotes partial recovery of reflex modulation and forelimb function following moderate spinal cord injury.
  • The feasibility of translating SCAP to human clinical trials for spinal cord injury and other sensorimotor disorders is supported by the findings.