Just saw this. Yeah an MRI would show soft tissue damage. That might be a torn or severely strained ligament on the inside or outside of the knee, or the patellar tendon.

Again, find a surgeon who specializes in revision surgery. And please, get away from impact sports. I know that's hard. I ran marathons before my TKRs. Now my knees feel great and there are a lot of other things to do, like spinning, rowing, etc.

Marcia - is the knee swollen? You've probably done this but I suggest a heavy course of icing the knee to reduce inflammation. As far as diet, cut out any added or refined sugar. Sugar increases inflammation in the body and you don't need that. If you're diet is sound, ignore.