You are having quite the rocky journey.
As you can see, I am out 3 and 4 years. My right knee is doing exactly as I had expected. It has good ROM, it is not particularly uncomfortable...what more could I ask. My left knee is a totally different story. From day one of surgery, it was substantially weaker and problematic and continues to be so to this day. My original surgeon felt that it was because I was stressing it with my "obesity". I could understand that however, my reasoning says...same knee implant, same kind of surgery, doesn't make sense to me! After being two years out and still using a cane and still having lots of swelling above the knee and weak quads, "I" decided to go back to PT and get some functional therapy. To help me improve my life. It did improve my balance and functionality, but not as much as I hoped. Because of a move to a new state, I visited a surgeon who was a revisionist. He assessed my knees and said there was no problem with the replacements but exercise and weight loss would help. He did not feel that at this time a revision was needed.
Since then, I have dropped a few pounds and have started doing personal training and ride the recumbent bike. Guess what the result is? My knee is still swollen, and still hurts. My strength is improving. Will I ever be as mobile as I like? Will I ever be free of pain? I cannot answer those questions. So my decision for MYSELF, is that I will live my life 100% with the resources that I have available today. I will work toward a better well being and pray that I my knee will improve. This is not to be critical of you or anyone. This is just saying that I had to do what I could and then be at peace with my challenge.
Hang in there. You obviously are a very strong and determined person. You are going to make it. I know you will.