Does anyone know if there is any data regarding ASD (Adjacent Segment Disease) as far as whether it is more common above or more common below a fusion? For example, a T only fusion you expect to a certain degree ASD in the L. If you fuse the L then would the ASD most likely continue below the L into your hips and other locations or is ASD possible in the C and shoulders?

Or is it more likely that if ASD were to occur in the C and shoulders above the T, it would have already happened if it was going to happen seeing as how itís been 15+ years already with no issue?

I hope this all makes sense, I havenít finished my coffee yet this morning so please bear with me.