The ACL stabilises the knee for chopping, twisting and jumping and pivoting action. The anterior cruciate ligament is in the center in the knee joint. Any time you tear an ACL, you are going to normally feel or hear a pop, really feel the knee shift away from spot and https://www.theorthopaedicandpainpractice.com/what-should-i-do-if-i-have-a-collateral-ligament-injury-of-the-knee/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB