The ACL stabilises the knee for slicing, twisting and leaping and pivoting exercise. The anterior cruciate ligament is in the center of your knee joint. After you tear an ACL, you might usually really feel or hear a pop, really feel the knee change from location and produce sizeable swelling 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