1160. Flex-ex criterion // Dose of methylprednisolone for traumatic spinal cord injury September 22nd, 2009 by reuben in .trauma-spine & spinal cord Back Top Tags: card 1159. 3 Questions to answer for Canadian C Spine Rule // What is the retropharyngeal space? Acceptable width? 1161. Three types of neck injuries by mechanism // High vs. low velocity GSW and its clinical significance // Three zones of the neck Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.