hi, thank you for providing the brief history of you. A thorough Musculoskeletal assessment is advised. As your doctors mentioned you have bone on bone for which TKR is the remedy, i suspect you have arthritis of the knee joint. Also, TKR is a successful procedure to get the pain and other symptoms reduce. May be you have too much damage of the ligaments with in the knee joint and now the knee has only swelling and grinding of bone to bone. I will advice you to initially try doing physical therapy, as with this, your pain will be reduced by using the therapeutic ultrasound therapy and TENS therapy. Then the physical therapist will perform passive ROM exercises to regain the knee bending and later, strengthening of the knee joint and lower limb as a whole, post which if you plan to go with TKR it will be a good outcome sore. As your muscles will have a strength to assist you further for the TKR. In my clinical practice, patients who required TKR, undergo the physical therapy to regain the muscular strength pre TKR and post TKR with physical therapy again the functional ability of the joint is achieved. Regards Jay Indravadan Patel