The ACL stabilises the knee for cutting, twisting and jumping and pivoting action. The anterior cruciate ligament is in the center in the knee joint. If you tear an ACL, you will usually feel or hear a pop, feel the knee change from place and acquire important swelling in only 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