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White matter changes in corticospinal tract associated with improvement in arm and hand functions in incomplete cervical spinal cord injury: pilot case series.
INTRODUCTION: This is a prospective clinical pilot case series. Improvement of arm and hand functions after spinal cord injury (SCI) is one of the major rehabilitation goals. Electrical stimulation of the primary motor cortex via transcranial direct current stimulation (tDCS) coupled with high-intensity repetitive motor training may have potential to facilitate improvement in motor function in chronic, incomplete cervical SCI. We investigated the relationship between motor recovery and changes in white matter integrity in response to treatment intervention. This study was conducted in The Institute for Rehabilitation and Research Memorial Hermann, Houston, USA.
CASE PRESENTATION: Four right-handed adults with chronic, incomplete cervical SCI (age, 36-63 years, American Spinal Injury Association Impairment Scale grade C-D) were enrolled in 10 sessions of anodal tDCS at 2 mA versus sham tDCS followed by 1 h of robotic-assisted arm training. Changes in arm and hand function were measured with Jebsen-Taylor Hand Function Test and Motor Activity Log-Amount of Use. Diffusion tension imaging was used to measure changes in fractional anisotropy (FA) of corticospinal tracts (CSTs).
DISCUSSION: After 10 sessions of treatment, we found greater improvement in hand function and hand usage in patients who received active tDCS treatment versus sham treatment. There was an overall positive change in FA values across all patients. We show changes in arm and hand function associated with changes in CST tractographic mapping to quantify the motor system components in chronic incomplete cervical SCI.
CASE PRESENTATION: Four right-handed adults with chronic, incomplete cervical SCI (age, 36-63 years, American Spinal Injury Association Impairment Scale grade C-D) were enrolled in 10 sessions of anodal tDCS at 2 mA versus sham tDCS followed by 1 h of robotic-assisted arm training. Changes in arm and hand function were measured with Jebsen-Taylor Hand Function Test and Motor Activity Log-Amount of Use. Diffusion tension imaging was used to measure changes in fractional anisotropy (FA) of corticospinal tracts (CSTs).
DISCUSSION: After 10 sessions of treatment, we found greater improvement in hand function and hand usage in patients who received active tDCS treatment versus sham treatment. There was an overall positive change in FA values across all patients. We show changes in arm and hand function associated with changes in CST tractographic mapping to quantify the motor system components in chronic incomplete cervical SCI.
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