Looking at my squats it can be overtly seen that i have a strength imbalance between the left and right leg. It seems to cause a few things to happen on the concentric portion of the lift:
-hips rotate to the left
-right knee comes inward
-left knee comes outward
I've been to a chiro in recent times and we found that along with some tightness in the hips one of my legs would be 'artificially' shorter than the other by 1-2cm.
(Doing a 90/90 hamstring stretch my 'long' right leg would feel much tighter and harder to stretch than my 'short' left leg.)
These symptoms would suggest some kind of problem with the sacroiliac region.
In the past i have strained my back doing deadlifts using a mixed grip, applying slightly uneven pulling forces, the strain would always be lateral of the spine , pretty much where your internal/external obliques start. Strain in that area indicates sacroiliac dysfunction.
I've read that overpronating feet can also be one of the causes of sacroiliac sublixation.
The sacroiliac joint/bone doesnt really move a whole hell of alot , but if something is a little bit out of place it can cause alot of muscles around the hip to tighten up and cause you trouble .
What im trying to figure out...is it the chicken or the egg ?
Am i getting tight hip muscles and strength imbalance BECAUSE OF pelvic misalignment ? Or is it the other way around where a strength imbalance CAUSES pelvic misalignment and then causes tightness ?
Or maybe im not even on the right track here ?
If you have any questions i will try to answer as best i can.