injury playing interscholastic sports highest number of issues hurt each year Johns Hopkins School of Medicine traumatic brain injuries 3.5 million sports injuries each year top 10 most dangerous sports in America According to the American Academy of Pediatrics Johns Hopkins Medicine TBIs among children statistics millions of kids and teens are injured TBIs among children John Hopkins Medicine injury playing interscholastic sports an estimated 30 million children Johns Hopkins Medicine 3.5 million sports injuries each year 2 million of these students 3.5 million 3.5 million injuries related to playground activity injury playing interscholastic sports injury playing interscholastic sports