The ACL stabilises the knee for slicing, twisting and jumping and pivoting exercise. The anterior cruciate ligament is in the middle from the knee joint. If you tear an ACL, you will often really feel or hear a pop, sense the knee shift from position and establish major swelling in 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