You can use a poster or a tablet to educate your patients, but they will see an image on a poster or a tablet. If you use a 3d model, they will have a spine in their hands. There is not a minute to loose in a clinic and a DDD model is simply the best way to demonstrate back pain. I use the same model since 5 years and it is still in very good condition. Quick, visual, concrete, straight to the point.