Lannie,
So sorry to hear that your recovery isn't going well. I have not had TKR, but I have had a manipulation. I had it 10 weeks after an arthroscopy with partial lateral & medial meniscectomies. I was never able to get more than 45 degrees of flexion so decided to have the MUA. I chose to be awake during the procedure and had spinal anesthesia. I have heard that many people have had bad experiences with MUA, but in my case it was helpful - my knee is not perfect by any means but it has definitely improved. The really important part is to get the knee moving afterwards, have physical therapy and make sure the pain is controlled so you can get the knee moving.
You might want to post in the arthritis/ knee replacement section - I'm sure there are many who have had TKR and MUA who could give you more input.
Good luck to you whatever you decide!
mp