Concussions in sports typically arise from a hard blow to the head. In soccer, for example, head-to-head impacts carry a high risk for concussion (Withnall et al., Br J Sports Med 39(Suppl 1):i49–i57, 2005). In the National Football League (NFL), an injury reconstruction study revealed that a striking player often lines up his head, neck, and torso to deliver maximum force to the other player in helmet-to-helmet impacts that result in concussive injuries to the player being struck (Viano and Pellman, Neurosurgery 56(2):266–280, 2005). Fortunately, most injuries in sports fall on the milder end of the spectrum of mild traumatic brain injuries (MTBI). Occasionally, however, athletes experience complicated mild, moderate, or severe traumatic brain injuries. In equestrian and auto racing, for example, accidents can result in much more serious injuries to the brain.