Sumiya S, et al. - Prospectively collected data of 179 consecutive patients who underwent intraoperative neurophysiological monitoring during posterior cervical spine surgery for compression myelopathy were retrospectively analyzed for the preoperative factors in patients with deteriorating spinal cord function due to flexion of the neck during posterior cervical spine surgery by observing changes in waveforms on intraoperative monitoring. Researchers analyzed in total, 156 patients in this study. Risk factors for intraoperative spinal cord injury during posterior cervical spine surgery comprised a large anterior compression component and large kyphotic angle in neck flexion at the most compressed level.