The knee joint is surrounded by fluid-stuffed sacs called bursae, which serve as gliding surfaces that cut down friction in the tendons. Under the kneecap, There's a large tendon (patellar tendon) which attaches for the entrance on the tibia bone. Reinforce Supporting Muscles – Strengthening the muscles within the knee 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