When I was small, my grandmother had hip replacement and ended up permanently in a wheelchair, but I don't know what her story was.

I can see how rehab must be really hard, because we're told contradictory things about pain, and it's hard to know what's a "if it hurts then do it slower and stop half an inch sooner and then put some ice on it" and what's a "don't keep doing that! Pain means stop!"