Not sure if it's been mentioned lately, but there's the Pelvic Instability Association you can go to for great information and latest research. It's going through a name change but you should still be able to google it and look it up on Facebook.
It's been nearly 3 years since my last child was born and I still need to see the osteo to put me back into alignment. I came off my horse the other week landing on my hip (actually, my whole left side!) - as soon as the bruising subsided I went back to the osteo, because it felt like a concertina effect and I wasn't taking any chances with my pelvis.