This seems to be an ages old question - and something tells me it will never really be totally answered.
My personal conclusion is that it may well be a contributing factor, but NOT an actual outright cause.
Now in my particular case - yes there were various physical punishments, but nothing that I would call abuse, and even less so when you consider the time and location (within the country - we did move around a lot). Basically such things seemed pretty normal almost everywhere (and there were distinctions to separate that from actual abuse). I do recall the farther east we ended up, the less acceptable/more strictly regulated and enforced that got.
HOWEVER - there was a rare issue with my eyes discovered at about 6months old (glaucoma - in itself not THAT rare, but it is to be born with it so...) - then a few years later, IC issues caused by nerve damage was discovered. And more and more just seemed to keep showing up. That did eventually slow down - but actually never totally stopped coming until I was 25. (CP was eventually DXed at 18, that explained not all, but a lot of issues that previously had no known cause - 25 was when Menieres showed it's ugly head - that is a rare hearing and balance disorder, and that likely would not have been found if it weren't for suddenly not having any useful hearing in my right ear. Had been getting extremely dizzy for no apparent reason for years, but without the loss of hearing to go with it, no one seemed to be able to even guess).
Growing up - in an effort to try to make things a little easier on myself and others, I did have quite a few objects (on top of diapers) around that actually had medical sounding names (don't bother asking what they were called - WAY to long ago to remember, and not short names) - knowing what I do now - basically they were AB items, just with a fancy name, and slightly different shapes, ex. (Like for example, a square shaped bottle - because I had major issues gripping anything round, and seemed to just constantly spill any liquid unless the flow was pretty restricted - even then I would drop it a LOT, but at least it stayed in the container instead of going all over the place that way).
So I guess you could say there was a certain amount of trauma just constantly finding all these medical issues, lots of them with no known reason for at the time. But then you also had all those item around like forever, so to use them nbd, always had pretty much, just had a slightly different look, but the function was the same.
BUT even with all that, I don't think AB ever really came out, and may not have at all if it were not for this girl I took a liking to in my early teens - but that is a whole story in itself, and already explained in some detail in a different (pretty old) post.