Hi I'm 20 years old and have been suffering from degenerative arthritis I my left knee due to injuries for quite some time now. I've had two major tear surgeries(acl and dual meniscus and mcl tears), it's been drained and I have gone through cortisone injections. Also according to a recent mri I have severe cartilage/bone loss. Now because if all this and the fact that I can't run, dance, our even walk without it giving out my dr wants me to get a knee replacement. I have heard a lot of different things