Very complex question – depending on who you ask your are likely to get a different answer. From my gatherings of the literature I do not like to point fingers toward one specific location. Some will point to individual muscle structures – McGill – QL, Queensland Physiotherapy Group – Multifidi/TrA…While pioneering work by Janda believe it roots in neurophysiological predispositions and Kendal through mechanical alterations. In my studies, I have come to conclude there is no absolute answer and many of these in combination can be the issue. I believe the posture of an individual that they routinely consume will dictate the dysfunctions.
Would love to hear your input being on the PT side.
Fuel the Movement,