realigning the SI? things you can try.
for me, it depends time to time and sometimes i can get it back in and sometimes it takes a few days.
a few simple things to try:
stand in door way, back against on side of the frame, bring one foot up (raise leg about 90 degrees) and push it into the doorframe on the opposite side from where you are standing, repeat with other foot.
sit on chair, bed, where ever, and squeeze something like a pillow, book, etc, between your knees. when i'm loose and / or a bit out, i can hear it crack back into place.
laying down on floor on back, knees up off floor, again put something between knees so that knees are about shoulder width apart and squeeze.
there are more complicated things to try as well. you can push your knees out into someone else's hands while laying on back, you can put your legs straight out while laying on floor and push into someone else's hands or into the wall.
then there are times when i will sit in the recliner and put myself in odd positions and then push against the chair, either pushing my back into the back or pushing my legs or feet into the seat, while at various angles until i feel something give and feel better.
i also have this yoga move i do when the misalignment is further down, where i stand against a wall and end up like the letter T, with one foot on floor, and the other leg out 90 degrees, i start off facing in same direction as foot, then turn facing away from the wall. that will help crack something lower down, where buttocks ends and leg begins.
all of this is basically just different isometric exercises.
as karen said, a good PT can teach you how to do these things.
sue
