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In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
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Modeling Trans-Spinal Direct Current Stimulation in the Presence of Spinal Implants.

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    Metallic spinal implants do not significantly alter electric fields during trans-spinal direct current stimulation (tsDCS). This suggests tsDCS is safe for patients with spinal implants, despite initial safety concerns.

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    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Medical Physics

    Background:

    • Trans-spinal direct current stimulation (tsDCS) modulates corticospinal circuitry for treating neurological dysfunction.
    • Metallic spinal implants are common in patients with spinal injuries, posing potential safety concerns for neural stimulation.
    • Current safety protocols often exclude individuals with metallic implants from neural stimulation procedures.

    Purpose of the Study:

    • To investigate how spinal implants affect electric field (EF) and current density (CD) during tsDCS.
    • To assess the safety of tsDCS in the presence of metallic spinal implants.
    • To determine if spinal implants alter stimulation intensity within the spinal cord.

    Main Methods:

    • Computational modeling of EF and CD generated by tsDCS.
    • Simulations included two electrode configurations and four spinal implant locations.
    • Comparison of scenarios with and without spinal rods to assess implant effects.

    Main Results:

    • Spinal implants influenced peak current density (CD) compared to no-implant conditions.
    • Maximum calculated CD levels were significantly lower than thresholds for tissue damage.
    • Average electric field (EF) within the spinal cord remained largely unaffected by implant presence.

    Conclusions:

    • TsDCS in the presence of spinal implants does not appear to generate unsafe current density levels.
    • Spinal implants do not significantly alter the average electric field within the spinal cord during tsDCS.
    • Findings support the potential safety of tsDCS for patients with metallic spinal implants.