I’m sorry you have stiffness in both knees. I had one TKR and ended up with limited range of motion and a diagnosis of arthrofibrosis. I belong to a Facebook group of about a few hundred people who have this condition. You may want to join it. You will learn of a few doctors who sort of specialize in arthrofibrosis. You will also find support from this group. Dr. Henry Finn of Chicago might possibly be able to help you with his hinged knee replacement. Personally, I’m going to go to the mayo clinic in April and see what they can do for me. I wouldn’t give up if I were you. Another thing I can say is I think it is hereditary also because my mother had a frozen elbow, and after my kidney surgery I was told my abdomen was full of scar tissue from previous surgeries. Now that I have one kidney I can no longer take NSAIDs by mouth but I have been told I can use the topical one, Voltaren gel. You may want to look into that for some minor relief. The best of luck to you.