... the lower region of the [vertebral] column suffers from the excessive pressure and oblique force exerted on its curved structure by our upright posture.
In my case, and how.
Basically, the vertebrae in the back are wedge shaped, this shape being most pronounced in the lower back. These wedges, along with the "S" curves in our spines (developed in response to an upright posture) and with the discs in between the vertebrae, is what allows us to flex and twist and bend.
In my case, at least one of my lumbar discs is narrowing at the front, causing me to pitch forward. The cause of the narrowing, is of course, Degenerative Disc Disease, which I already knew, but it doesn't make standing upright any easier for me, in fact, it's downright impossible.