Your ACL, or anterior cruciate ligament, is one of the key bands of fibrous tissue that contribute to stabilising your knee joint. The particular job of the anterior cruciate ligament in particular is to prevent your knee from hyperextending. This means that when you straighten your leg it stops your lower leg from moving too far out in relation to your upper leg. When you kick a football, this is what stops your lower leg from hyperextending. It is also one of the ligaments that contribute to your ability to “lock” your knee with a straight leg. Often this ligament can rupture due to a sporting injury or other means and it is often associated with soccer and American football as the “classic” knee injury.
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