@rosiegirl I hope the new doctor can help you, but if not do not give up. I have found that sometimes doctors are influenced by personal feelings toward a doctor. I have had that happen a couple of times. Check out the doctor's ratings on things like Vitals and Healthgrades. I never believe the ratings unless there are a substantial number of them though.
JK

Hi @rosiegirl - I want to add my Welcome to the others. Glad you are here on Connect! It must be awfully discouraging to have the pain/swelling you have had and THEN have your doctor retire. I'm glad you are seeing another surgeon. I've had two TKRs - one in 2017 and the last one earlier this year. My surgeon told me that many people have problems kneeling after surgery. That has been true for me. He also said that many people report that kind of popping or clicking noise. I have not had that. So while I wouldn't necessarily be too concerned about the kneeling or the sound, I would be worried about the bending backwards, the pain and the continued swelling. It sounds as if you are doing all you can do to get to the bottom of the problem. Have you prepared a list of questions for your new doctor? If I were you, I would jot some down - along with some of the things you have told us here like when you had to quit swimming and how the pain has gotten worse and worse (not better and better). If you are anything like me, I have the timeline and questions in my head, but the facts don't necessarily make it out of my mouth when the doctor steps in. Will you let us know how your new doctor visit goes?