On a beautiful spring morning in 1989, neurosurgeon and spine expert Volker Sonntag was just finishing rounds at Saint Joseph's Hospital in Phoenix, Arizona. At that same moment sixteen miles away, a hard-charging boy named TJ veered his bike into the path of a speeding pickup truck. The impact all but killed the boy, leaving him with a shattered leg, severe internal injuries, a massive blood clot near the brain stem, and--but for the fragile spinal cord--a complete separation of the skull from the spine." What happened next?