I'm so glad you asked!
My knee is killing me. I had the cartilage removed freshman year of college (an injury that ruined my HS senior year of basketball and track) and I don't usually have problems with it. It's killing me. But I am still taking the stairs at work. It's just scar tissue, it'll probably work it's way better.
eta: I just reread this and realized I said "killing me" twice, and what hyperbole to begin with! It's not really killllliinnnngggg me. It just freaking hurts.