I was studying the pelvic rotation and treatment for it, so for the right side anteriorly rotated innominate, on examination on long sit test, supine involved leg (right side) will be longer and sitting (shorter leg) compared to uninvolved side. Treatment will be stretching of the rectus femoris and strengthening of the hamms and gluts. Right?

If a patient presents with a right sided anteriorly rotated innominate, then the clinical presentation when the supine-to-sit test is administered is; the right leg would appear longer than the left (or uninvolved) leg while the patient is in supine lying and thereafter, shorter than the left leg while in a sitting position. Please note that this is not a true (or structural) limb length disparity but a functional disparity caused by the rotation of the right innominate.

Will’s video offers a more comprehensive explanation.

The general intervention guidelines for presentations of this kind are to stretch tight muscles (in this case, the hip flexors/rectus femoris muscle which is chiefly responsible for the anterior rotation) and to simultaneously strengthen weak muscles (in this case, the hip extensors/hamstring muscle group) to counteract the anterior pull on the innominate by the tight hip flexors.

Video