Why do I have a burning pain 3 months after a total knee replacement?

I had the same question as I am now 6 months after a total knee and it is finally getting better. At three months I was facing returning to 12 hour shifts with a lot of pain that my ortho Md made me feel like a drug addict because I still had so much pain. The physical therapy department was the most help. Apparently while putting the knee in the nerves are severed and they start to reinnervate the tissue making a pathway again, while they are doing this it can be quite painful. You probably have one side of your knee and leg that is numb, this will get better over the next couple months -but there is some very sharp steady pain that shoot thru the kneecap and down into the leg. The therapist told me what that nerve was but I don't remember.