I've wondered something similar about my son. I'm actually beginning to wonder if he didn't have some vitamin D deficiency around that time. Speaking as a fellow northern latituder, it seems quite possible that our kids could have gotten less sun and be fussy enough eaters that they weren't getting a whole lot of vitamin d from milk.
My son had the additional hit of being a homeschooler who, during his late teen years (when all the curving started) would flip his schedule around so that he was waking up late in the afternoon. In Oregon, it's hard to get sunshine if you're out at noon. If you don't get out until 3, it's damn near impossible.
So, yeah, I absolutely think it's possible.
I still think they have to have some kind of asymetrical loading for the vitamin D deficiency to make sure a difference. So, the bones are more prone to molding because they're weaker, and then the slightly obsessive character of these kids (is yours on the asperger's scale? Mine was pretty far out on the scale as a young kid, and is almost "normal" now, so he was probably mid way on the scale during the curing years) means that they're often in roughly the same position for a long time doing something obsessive.
Anyway, yeah, I've been giving this a good deal of thought lately. I think it has to be a perfect storm kind of situation - take a scrawny kid, throw in some odd character traits, move them to some northern climate, and they start twisting up.
Or, maybe it was all written in detail in their genes and we can stop second-guessing ourselves

. Frankly, I'd *like* to believe that all scoliosis is 100% genetic. It would keep me from feeling like I let him down completely by letting him engage in the risky behavior of sleeping late in a northern latitude. I'd like to. But I don't.