I had this when I was three...I don't know how much help I can be to you, other than to say I know they cut more nerves going to what was my "worse" side, and that side is now better than the other in terms of spasticity. I suppose I would not be as ambulatory now if I had not had the surgery. I had to go to therapy after it, where they strengthened muscles and helped me practice walking (this info per my mother :)). And ummmm, the scar was the length of my entire back after I had it, but is now very small and on my lower back (I'm almost 20).

Hope someone can give you some more detailed info.