You don't usually call a man "lucky" after he wipes out on a snowmobile, breaks bones, and has to be medevaced to the nearest trauma center.  You do, however, when you realize just how close he came to severing his spinal cord.  Dr. Michael G. Kaiser from the Spine Center was this man's surgeon...

This completely painless, non-invasive procedure will help your doctor assess the density of your bones, and determine if you have osteoporosis, a bone thinning disease. This information may be used to predict your risk of bone fractures. The lower your bone density, the higher your risk for bone...

Most healthy bones can withstand substantial forces. If the force is too great for the vertebrae to sustain however, one or more of them can fracture. If the bone is too weak to withstand normal pressure, it may not take much force to cause the vertebral body to collapse. Compression fractures of...