If you’re looking for more in-depth information on sacroiliac joint dysfunction, here are a few sites I’ve found helpful (this list is not exhaustive.)
The opinions expressed on these websites are strictly those of the person who wrote them. Take what you like and leave the rest. I am not endorsing anything or anyone; just offering to save you a step or two in your search for answers that are relevant to you.
A few websites and blogs:
A few Facebook Groups (there are others dealing with more specific topics):
Various minimally invasive si-joint fusion methods (in alphabetical order):