Intense competition and year-round scheduling demands are now common trademarks of adolescent sports. As a result, we see more and more sports-related injuries, including the all-too-frequent anterior cruciate ligament (ACL) injuries. Dr. Bert Mandelbaum, president of the Santa Monica Orthopedic and Sports Medicine Research Foundation in Santa Monica, Calif., and principal investigator of the ACL Prevention Project, shares details of his potentially groundbreaking program, with results published in the American Journal of Sports Medicine. When should young athletes begin this prevention regimen? Taking the mechanisms of prevention a step further, can we teach athletes to run, jump and land in ways that will lessen their risk of injury? Dr. Mark Nolan Hill hosts.