Greetings Steven,
I find myself explaining the engineering of the Gothic Arch to people (mostly med students, that have been taught the outdated short leg theory and its treatment) and when i get to the end of explaining the WBI phenomena (IS locked up, type I or II spine curve) that can transpire , I have been asked “well how does the foundation or Apex lose its structural functionality” and i dont really have an answer for them. I make up some ideas that i think could throw off the structure. I was hoping you could shed some light on this matter.
Cheers,