I had it when I was 13. It was the probably the easiest of my 7 surgeries. I was in very little pain on the whole, the only drawback is that my legs are really weak now and I developed lumbar lordosis. Make sure to discuss lordosis with your surgeon before hand. There are two ways that they perform the surgery. The names are escaping me at the moment, but I'm sure you can find info on the internet. The way they did mine was they made about a 3 inch incision on the back of my leg above my knee. Then they took this long hook thing and literally stretched the tendons. They also released the tendons on both sides sides of my legs to allow the other ones to stretch.
I had it this summer (I'm 19). I had casts on for a month, the pain wasn't too bad, and I am still going to physical therapy but so far my recovery has been good. They did my incision on the inside of my thigh, although the scar is still purple you can't even see it unless I turn my leg. The surgeon could not get my legs all the way straight (only about 95%) because the tendons in my knees were too tight...but that's ok, because then I don't have to worry about my knees hyperextending.
My knees crack A LOT now... but they're straight enough for me. (I think I might have arthritis in them, since I have it in my toes...just what I need lol) My dr. said if I wanted to get my legs all the way straight he would have to cut my femur, because my legs aren't the same size or something. No thanks.
Not saying the same thing would happen to you, though.
lol) My dr. said if I wanted to get my legs all the way straight he would have to cut my femur, because my legs aren't the same size or something. 
No thanks.
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