Inclusion Criteria:  Male or female aged 17 years or older Spinal injury between bony levels C3 and L1 inclusive Motor complete acute traumatic SCI (AIS A or B) or motor incomplete SCI (AIS C) with a total lower extremity motor score of less than 5 Blunt (non-penetrating) SCI requiring posterior laminectomy with stabilization/fusion surgery within 72 hours of injury Able to communicate in English and provide informed consent  Exclusion Criteria:  Isolated radiculopathy or cauda equina injury Spinal cord impairment secondary to tumour, infection, epidural bleeding, or ischemia (in Any condition or injury (e.g. Morel-Lavellee lesion) that would interfere with the application or readings of the NIRS sensor Associated traumatic condition that would interfere with the informed consent process or outcome assessments (e.g. traumatic brain injury, pelvic, abdominal, or thoracic injuries) Any other medical condition that, in the investigator's opinion, would render the protocol procedures dangerous Female patients who are pregnant