I had the surgery a year ago
and I still deal with chronic joint
and muscle pain daily. So once you are off the
Keppra, if you are still experiencing the pain, I would look into it further. From what I have discovered so far is that muscles and ligaments are loose around the joints thereby causing me pain. You may want to look into some type of PT to help keep those muscles strong.
Hopefully you will get some more answers on the other questions!