You talking like you experienced it, I'm guessing.
Had to get used to walking again after I blown out my right patella in my early 20's, but it wasn't like full on Therapy and such.
I saw that first hand with an old classmate of mine that survived a shooting that left him partially paralyzed and he had to re-learn the process.
Was doing maintence at the hospital and all I could do is hit him with the

As I'd pass him and the nurse walking down the hall ways, him with a walker, in the booty gown, wearing ankle socks looking like Methusala.
He made a mostly full recovery though. Partial loss of motion or some shyt like that and hearing him tell it was horrid enough to hope to never want to experience that.