Knee injuries in sports have been known to be very common. Specifically anterior cruciate ligament (ACL) injuries. Males and females can suffer from knee injuries whether their sport involves or does not involve contact. Not only to athletes, but to every human, the knee is a crucial part to the human body. Obviously, without a knee there would be no way for a human to walk, run, jump or do regular every day things. Depending on the knee injury, people can be kept out of activity for several months, then has to go through rehab for even longer.