I have been putting off a TKR because of stories like yours. This might sound nuts but I have watched so many videos to help and what has helped me more than anything is strengthening my glute muscles. It is not a cure-all, at least not so far, but you can get immediate relief by doing about 20 of the glute exercises as needed. I learned this off of youtube by a physical therapist. My knee hurt so bad and the pain at night was awful. I had all the shots too and Dr. said it was bone on bone. I had a bad experience with the Iovera treatment and wound up cancelling my surgery. This was 5 months ago and I have not rescheduled and doubt I will. It doesn't hurt to give it a try and when nothing else works you have nothing to lose. I too am 75 and do have other health problems but get around fine except for the knee pain. I take tylenol very rarely and do use kt tape occasionally. I played golf today and I'm hurting a little more than usual but I will ice it tonight and get back on the glute exercises and will feel a lot better. I hope you give it a try