The pain and stiffness affect the thoracolumbar fascia, also called the lumbodorsal fascia or simply LF.
But fascial tissue also has flexibility, as well.
And the thoracolumbar fascia is a key player in contralateral movements.

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A perfect example of this is the act of walking.
Second, after an injury, it’s common for tissues to become stiff.
And finally, as we’ve seen above, injury tends to stimulate nerves.
This can lead to increased sensitivity to pain.
Many back muscles attach to the thoracolumbar fascia.
The paraspinals are attached to the thoracolumbar fascia, as well as to the bony spine.
Along the way, it connects with thetransverse abdominal muscle.
The front part of the thoracolumbar fascia (the anterior layer) covers a muscle called the quadratus lumborum.
The quadratus lumborum bends the trunk to the side and helps maintain a healthy upright posture.
The quadratus, as it is sometimes called for short, is often implicated in muscle-related low back pain.
2017;2017:5349620. doi:10.1155/2017/5349620
Nickelston P.Thoracolumbar fascia: The chronic pain linchpin.Dynamic Chiropractic.
2013;31(21).