A 73-year-old male presents to the emergency department after a fall from a ladder complaining of severe acute on chronic neck pain. Physical exam shows he has diffuse tenderness in the posterior cervical spine, normal strength in all motor groups, and 2+ bilateral patellar reflexes. A clinical photograph of him prior to the fall is shown in Figure A. The patient had bilateral hip replacements 2 years ago in the same hospital and his preoperative radiographs are shown in Figure B. He has a long history of chronic low back pain, and radiographs of the lumbar spine from 1 year ago are shown in Figure C. What is the most likely diagnosis, and what should be the next step in management?