This is an extreme case of a lumbar fusion that didn't go well. In this scan you can see almost every type of fusion device. You will see the Rods and screws, the internal disc fixation devices and bone matrix fusions. Fusions are just that, a device to fuse the spine.The concept is that a spine that is fused will not cause pain since the discs cannot move and the bone is hopefully pulled away from the nerves. Fusions offer a 70% success rate for the lumbar region but up to 90% for cervical regions.