This study will evaluate the effect of single transplantation of HuCNS-SC cells into the thoracic spinal cord of patients with sub-acute spinal cord injury.

Study subjects will receive immunosuppression for nine months following transplantation. All enrolled subjects will be followed for one year following transplantation and then will be enrolled in a separate long-term follow-up study for an additional four years.

Inclusion Criteria:

• T2-T11 thoracic spinal cord injury based on American Spinal Injury Association (ASIA) level determination by the principal investigator (PI)
• T2-T11 thoracic spinal cord injury as assessed by magnetic resonance imaging (MRI) and/or computerized tomography (CT)
• ASIA Impairment Scale (AIS) Grade A, B, or C
• Minimum of six weeks post injury for the initiation of screening
• Must have evidence of preserved conus function
• Must be at stable stage of medical recovery after injury

Exclusion Criteria:

• History of traumatic brain injury without recovery
• Penetrating spinal cord injury
• Evidence of spinal instability or persistent spinal stenosis and/or compression related to initial trauma
• Previous organ, tissue or bone marrow transplantation
• Previous participation in any gene transfer or cell transplant trial
• Current or prior malignancy