Many hospitals these days are making a TKR a same-day surgery. Personally, I don't like it, but many people do, so it's nice that those who like the policy can go home the same day. If you have no complications and are getting around, and wish to do so, going home the same day can be a good thing. On the other hand, if you have issues, they'll keep you a bit longer. In 2014, when I had my TKR, 3-5 days as an inpatient was the norm; last year when I had my revision, going home the day of surgery was the norm. I am hoping you're out of surgery and on your way to your new life with your new knee. See you on the other side!