10-m run test 10-m walk rest ACDF Clinical & internal medicine MRI Medicine SCI age automated segmentation blood-spinal cord barrier cervical and thoracic spinal cord injury cervical decompression cervical dizziness cervical plating cervical spinal cord compression cervical spine cervical spine degeneration cervical spondylosis cervical spondylotic myelopathy cervical spondylotic myelopathy (CSM) cervical torsion test cervical vertigo complications convolutional neural network cortical volume degenerative cervical myelopathy degenerative cervical myelopathy (DCM) degenerative cervical spinal cord compression dysphagia frailty