The ranks of female high school athletes who tore their anterior cruciate ligament are growing fast and researchers are pressing the sports world to take the devastating injury more seriously and trying to bolster prevention efforts. Despite decades of research on it, parents, researchers and trainers say that information isn't being used enough by teams, coaches or sports leagues. High school-age female athletes are the most vulnerable, sustaining ACL injuries at higher rates than both adults and their male counterparts. Trainers and researchers say there are effective pre-workout warm ups and strengthening routines that are designed to reduce the risk of an ACL injury.