The sacrum is called the holy bone, this bone is on the back and upper side of the buttocks of the human body, and the pelvis of the iliac body supports the weight of the upper body of the human body, and the flexibility and stability of the structure here are related to the quality of human movement. I would like to explain this structure further in terms of bone structure morphology. The structural problems here include iliac valgus, the pelvis is high and low from side to side, the pelvis rotates to one side, and the pelvic abdominal viscera is prolapsed due to insufficient support on the inside of the pelvis.
The nerves in the lumbosacral region are the farthest away from the brain, and the lifestyle habits of modern society often inhibit the signals of the lumbosacral nerve, causing the organization of the lumbosacral region to operate out of control or become dysfunctional.
In terms of sacrum morphology, if the posterior muscles and bones of the sacrum are adhesions too tight, the posterior branch of the sacral nerve is inhibited.
If the sacroiliac joint is turned back or the hip is rotated backward, the anterior branch tension of the anterior branch of the sacral nerve is less than the posterior branch tension, causing the iliac bone to turn backwards, resulting in a false hip width. Only by consciously activating the lumbosacral nerve and effectively distributing the tension of each nerve can the shape and function of the pelvis be restored.