It has been 10 years since the National High School Sports-Related Injury Surveillance System Study (High School RIO™) was established to provide the NFHS with a snapshot of the types of injuries occurring in high school sports. Since it began in the 2005-06 school year, High School RIO™ has remained the only surveillance study of all time-loss injuries in a national sample of high school athletes and has expanded from nine sports to a comprehensive report of 22 sports.. READ MORE