Orthopedic surgeons started noticing an alarming trend years ago.
More and more young female athletes were tearing their ACL's and then re-tearing them after surgery and rehab.
Dr. Bert Mandelbaum spent years figuring out why that happens in girls so much more often than it does in boys.
Now he's found an answer and has developed a program to keep it from happening in the first place.
To learn more, watch the video above.