I had the sort of surgery you mention way back in 1983. There are various ways to do such surgery. In my case it was known as a wedge osteotomy to the lower spine. My neck was unaffected by the A.S. at that time. A wedge of bone was cut out of the spine and the spine was then straightened out and held in place with titanium rods. As you can imagine things are done in a much better way these days. The surgery was a success and not only did it straighten out my spine but it also lead to much less pain. There was some snags but eventually all worked out very well. I would recommend such surgery to any A.S. sufferer that needs it. As with all surgery there are obviously risks but I found it all well worth the risks as the surgery was life changing. Let us know how you get on. In my case the surgery was done at the Orthopedic Hospital Oswestry, UK