I'm slightly hesitant to post on this thread seeing the way it is going, but my DS has CP, he can walk independently for a short distance, not as well as the girl on the film and I would possibly consider an op like this.
DS is going to have ops later on in life, probably sooner than I am ready for. He will have at least 2 if not considerably more. These will be on his tendons and possibly muscles also in his legs. We are doing all we can to put this off for as long as possible since they have a better chance of lasting the later you do them. Therefore he has had a second skin suit provided by the NHS, day and night splints, physio and oT from the NHS, intensive private physio, horse riding (we were referred by our NHS OT) and music therapy. However this will not put off the ops for ever. They are standard NHS provision and have a fairly high risk of meaning that he won't be able to walk at all afterwards as it may remove too much of his stiffness and this is what helps him walk. However if we don't do them he will gradually lose his walking ability and contractures will set in that may be painful.
Any op carries a risk, but you need to weigh up for your child what is best, when and how. Comparing to other children is not helpful because as we all know, nobody understands our children like we do. If this op could realistically give DS a chance of considerably better mobility I would consider it. I would first go to the place in the UK and then look at the place in the US. One of the ops that DS will definitely have is done better with less possibility of side effects in New York. When the time comes for that op I will look there as well. All types of ssurgery need developing and I would not dismiss it because it is not common in the UK. However I would do my research fully first. I haven't for this one so can't comment on whether I would do it, but I would consider it.
I have some sympathy with the social vs medical model of disability but for my DS, improved mobility would make an enormous difference to his life. It would be easier for him, not me, HIM, and that is the important point. He can talk, read, will always have probs with writing but will end up using a computer so the biggest thing that causes him to be disabled is his walking. If I can help with that I will.
This is a ramble but I'm going to post it anyway as DS2 is unwell and wants attention!