Hi Fry,
I’m not very sure what are the links you provided.
It seem like some medical papers from 1998 about injury caused by the seat belt to the common iliac? Is it the same as the si (sacrum iliac) joint?
I’m aware that I was probably sitting in a bad position when I had to quickly brake, not sure if it was the seat belt. I think it was more the whiplash force or something.