When my bad knee hurt, it hurt fierce!!! But... but it didn't always hurt.
My replacement knee is always stiff, is "twingy" most of the time but loosens up with activity each day and the pain there is, isn't very strong...
I do not trust it up on the roof like I did my natural one as sometimes it just doesn't "feel right" but it's only 8 months out...
Friend's dad had both and bought a used stationary bike and watched the news in the AM on rising and just peddled thru the news without tension on the bike to "oil them up"...