The vertebrae are connected by a disc and two small joints called "facet" joints. As you get older, the center of the disc may start to lose water content, making the disc less effective as a cushion. As a disc deteriorates, the outer layer can also tear.
If there is pain at one or more levels due to disc degeneration, the adjoining segments can be fused together to limit motion and stabilize the segment.
Spinal fractures can vary widely in severity. Some fractures are very serious injuries that result from high-energy trauma and require emergency treatment.