I was a bit worried about this, too. Before my second TKR, I tried to go down with my right knee (TKR in May) like I would need to after left TKR as much as possible as practice. It was kind of difficult to do the whole flight of stairs, but I could do it. Somehow it is easier to do now that the LTKR is done. I think all of the drugs and rest/elevating is actually helping my right knee so thing are feeling even better on my right knee than they were before the LTKR surgery. This has been good news, since I was worried about the increased strain on my right knee having to do more "work" during the left knee recovery. I hope it is the same way for you!