The knee contains two crescent-formed cartilage constructions known as menisci, which work as shock absorbers and aid easy movement in the joint. Tears inside the meniscus or cartilage can build from unexpected twists, deep squats, or degenerative alterations after a while.  The recovery approach for just a PCL injury varies https://www.theorthopaedicandpainpractice.com/what-happens-if-i-injure-my-posterior-cruciate-ligament/