The knee joint is surrounded by fluid-filled sacs identified as bursae, which serve as gliding surfaces that lessen friction of the tendons. Down below the kneecap, There exists a big tendon (patellar tendon) which attaches into the front of your tibia bone. Grade two: A partial tear to your MCL, 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