I'm starting to work on co-authoring the next edition of my chapter on "Spine and Spinal Cord Injury" within the textbook "Emergency Medicine" by Dr. Jim Adams (Northwestern EM Chair). There are some useful tables that I created that I thought you might find helpful. This is the first installment covering C1-C2 fractures. The next PV card will cover the lower cervical fractures.
I always forget which are stable and unstable. For instance, the above extension teardrop fracture looks innocuous but is an unstable fracture because the anterior longitudinal ligament is ruptured.
Feel free to download this card and print on a 4'' x 6'' index card.