The ACL, or anterior cruciate ligament proper, connects the femur bone with the tibia and is therefore very important in relation to the normal functioning of the knee joint, although there are numerous other ligaments making up the knee joint. And there a few, very few, that come to think of it, but one very important ligament for the knee is super duper helpful when human beings are... https://healthcheckbox.com/km/orthopedic/anterior-cruciate-ligament-acl/