Interestingly and contrary to what some of us have been taught the erector spinae don’t hold the spine erect. In fact, most fibers are electrically silent during postural work (Kippers 1984).
This muscle group is designed to activate during extension from flexion, i.e. standing upright from bending forward.
The erector spinae has three divisions each of which may manifest a trigger point. According to Simons, Travell, and Simons, individual pain patterns of several trigger points that refer pain to the Lumbosacral region may blend into each other.
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