@Cathleen
This is long, sorry!
I recently ran my first 5K after PKR and TKR in late 2015. I was slow, slow, slow - but it felt great. (The 30 pounds I've gained has more to do with the slowness than anything.) Mostly, I wanted to know I could do it again if I wanted to. I've pondered training for a 1/2 marathon, but I found the drive is no longer there to do any more distance than a 5K. 5Ks keep me in the game. The only thing that bothers me is that I love medals. It's rare to get a medal for a 5K!
I'm in the process of trying to figure out what my passion is these days. I had completed a few hard, distance mountain hikes before my first knee gave up the ghost. I loved it! So, I'm going to start hitting the trails soon and focus on flat ones for a while as I'm gaining more strength and endurance. My legs are pretty strong, but my endurance is horrible. A couple of friends who are currently training for marathons want to give distance running a break for while and are game for hiking...I hope it works out. Trekking poles will be with me.
All of this is to say that it takes a while. When they say a full year, believe it. But running again is possible
if you wait for everything to heal and take it easy starting out. I tried running too soon in my recovery (seven months in) and it felt like my lower legs were totally detached from the upper legs. It felt odd and I decided my knees needed a little more time so I ditched the running and became more purposeful with my walking. When I could easily do a five mile walk, I started working on getting faster. Then I started doing run/walk intervals and did a C25K program with my running club and ran a 5K in March. The good news is that the muscle memory is strong and running felt wonderful. The first time I ran for 15 minutes solid, I felt like I was living my life in full color again.
I ignored all of those who said I shouldn't run. I had a little pain along the way, but nothing a couple of Tylenol and ice didn't mend by the next day. Now I'm to the point that if I don't get in a daily walk mixed with a little running, I end up with stiff knees. It took me a long time to get to this point, but life is finally back to normal. I'm not sure if I'll ever get to the point where I don't think about my knees, but I do think of them less.