Once in a while, it's connected to swelling and warmth in the knee. It is commonly related to locking or an unstable sensation from the knee joint. The doctor can carry out certain maneuvers though inspecting the knee which could give further clues into the existence of the meniscal tear. 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