It took me 2 years after my right TKR. Yes, it was frustrating but I continued to do all the things I did prior to surgery but with soreness and hurting. It took forever to do steps as well but now I can go up and down alternating my feet which I couldn't do prior to the surgery. My thigh and quad muscles are still somewhat weak but I honestly do not know if they cut it when they did my surgery. The older we get the quad muscles do get somewhat weaker. Try and keep the faith but I know it's difficult. I still cannot walk long distances without hurting and soreness but it is what it is. Unfortunately replacing the knee can be perfectly done but there is so much that can be affected by the knee being perfect. My actual knee never bothers me but spinal stenosis can affect things as well which I do have. I take 600mg gabapentin morning and evening and it really helps with my tingling feet. Also Ibuprofen as needed and supplements like magnesium, calcium and a good multivitamin help as well. Best of luck to you.