My sacrum has recently started “flipping” into an awkward rotation causing the entire pelvic bowl to sort of twist (if that makes any sense?!) and thusly creating some major imbalances, muscle spasms, etc etc… Its as if you held me by the hips (illiacus) and tipped one side down (anterior side rotates inferior, posterior rotates superior) while tilting the opposite side up (anterior side rotates superior, posterior goes inferior). I have been a comprehensively trained Pilates instructor, professional dancer & teacher trainer for many many years so I have tapped into all of my experience and resources, yet still having the recurring problem. Have been working with a massage therapist 1x week to get through the fascia and loosen the sacrum to get movement/bloodflow back into pelvis, but still… I am desperately seeking corrective exercises to help me stabilize this wonky pelvis!!!
I am coming to this from a completely different perspective. I do this on a nearly daily basis, badly 6-8 times a year (like right now.) I would think about your other joints. Do you have hypermobility in any others?
It took me until I was 47 to diagnose myself (and it has since been verified and a sort of “ah haaaa!” moment for my practitioners) that I have Ehlers – Danlos Syndrome, often better known as hypermobility syndrome, benign hypermobility syndrome, EDS, HMS, or BHMS.
Since it is very rare, few practitioners look for it nor understand it. I have actually been educating my Osteopath and PT about it with an article I wrote and they now use with their patients.
The complication is that if you have this, the collagen was not developed correctly and so normal strengthening exercises may have little benefit and may actually exacerbate the problem. For me, there is only management with my DO and PT. My sacrum often ends up at 90 degree angles to my funky, unstable pelvis.
For more information, this might help: http://mbwalz.hubpages.com/hub/What-is-Elhers-Danlos-Syndrome
If you do not show signs of other forms of Ehlers – Danlos Syndrome, then ask your practitioner to perform the Beighton Test/score on you. Try it at home too.
I’m sorry this was not the answer to your question, as I also seek some stroke of genius to keep my sacrum stable, but I wanted to let you know of a little known condition that can cause this.