(1) an ascending postural pattern (pathomechanics originating in the feet) (See Animation below)Short Leg Syndrome due to pelvic unleveling should not be treated with heel lifts.
(2) a descending postural pattern (pathomechanics originating in the cranium or teeth), or
(3) a combination of both (mixed pattern).
Reference:
Ascending Postural Pattern for a Short Leg Syndrome