My father and my uncle both have had this done in the past year. My father only had one done, but can't wait to get the other done. It's changed his mobility and he's thrilled.
My uncle just had his done 2 weeks ago, both at the same time, and he's of course doing the therapy and both of his legs, which have been bowed since I've known him, are straight!

They both did so well, mostly because of their willingness to really work the therapy. There were a few elderly ladies in group physical therapy that were younger than my dad, and still in wheelchairs while he was about running. I think they liked the attention because they had been there 3 weeks and would sit and just gab.

Hope this helps.