What could cause anterior cruciate ligament (acl) injury ?

Knee hyperextension: The ACL may tear when certain movements of the knee place a great strain on the acl. Hyperextension of the knee, that is, if the knee is straightened more than 10 degrees beyond its normal fully straightened position, is a very common cause of an torn acl. This position of the knee forces the lower leg excessively forward in relation to the upper leg. Pivoting injuries of the knee with exc.

Force: An acl injury usually is a rotational or hyperextension force applied to the knee causing mechanical failure of the ligament. People get these injuries as a result of being fatigued, out of shape or are just in the wrong place at the wrong time.

Pivoting on leg.: Twisting or pivoting of your lower leg, while having your foot planted can cause an ACL injury. For example, a football or basketball player plants his/her foot to change direction, and feel their knee just give out on them. That's the classic mechanism for an ACL injury.