The patellar articular area may also be replaced but to some lesser extent according to the results with the surgeon in the surgery, that has a patellar button which is also made from the equivalent content since the tibial insert. Weakened bone and cartilage from your thighbone, shinbone and kneecap 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