More girls suffering ACL sports injuries

April 28, 2014 (WLS) -- As more girls compete in sports, more of them are suffering ACL injuries.

The ACL is a ligament in the knee that provides stability. Girls are especially vulnerable to injuries during puberty.

Doctors say that's because they're growing but their muscle power is keeping up. The American Academy of Pediatrics found that simple, at-home exercises can strengthen and protect the knees.

Done right they can cut the risk of injury up to 72 percent.