Surgery for replacement of my right knee was last Wednesday (1/7/2015) and I was home Friday afternoon. I have pondered about when/if for this surgery for the past three years, but by early December of last year I no longer had any doubts that it was time: most of my rides were painful, my speed dropped because I could not press hard, and climbing became much less fun.
Things seem to be going ok for recovery. The goal is to get back on the trainer in four to six weeks and on the bike shortly after that. From the anecdotes I hear from others, problems can develop with being too aggressive in returning to riding. Taking a moderate pace at rehab and getting back to the bike may sacrifice some short term riding time, but I hope it will result in longer term gains.
Others here have reported on their experiences with TKR and since this is likely to be an issue for other over 50 cyclists, I will give an occasional post about rehab and such as it pertains to cycling.
I was a bit disappointed to learn the knee prothesis is cobalt-chromium and NOT titanium, so it will not match my bike: bummer.