I see chiropractors for the SI joint. It is a simple quick adjustment with immediate relief. It doesn't last.
But, when your SI joint is out of it's groove it pinches the myriad nerves in the low back. It throws your whole body from levity, because then one leg is shorter.
My challengeable opinion is that when you push your self with this imbalance you are training your muscles to hold the pattern.
There are newer small devices to fuse the SI joint, which I wouldn't advise.
Once the joint is returned to it's normal groove, there are exercises to rehabilitate the ligaments and strenghthen the muscles.
Some PTs have a special training to do the intensity 5 thrust adjustment, but they don't do them often and I've never had a good SI adjustment from physcial therapy. They also are not great at recognizing the dislocation because no matter how great your pain the that dislocation is very small.
I've not had a bad SI from a chiropractor. But some are better than others.
It is such small things that can ruin our lives.
Best wishes