I have noticed that the right innominate bone goes into anterior rotation in the majnority of patients the more that hip abduction directly lateral in the coronal plane progressess.

Further, that if you landmark the PSIS to sacrum on the side of a supposed "stuck" or "fixation of" the SI joint and you have the patient do hip abduction directly lateral in the coronal plane, that the PSIS moves superior and lateral to the sacrum. How can a supposed stuck joint move apart?

Hope this is helpful
Best regards;

Neuromuscular.