The sciatic spine is a bony elevation of the sciatic bone. When the human body is in the sitting position, the sciatic spine is close to the lowest point of the sitting position, and there is a muscle attached to the sciatic spine. As the sciatic spine is wrapped by the muscle, the sciatic spine cannot be touched on the surface of the body. In the female population, it can be touched through the vagina, 5-6cm below the vaginal opening, by measuring the distance between the sciatic spines, you can estimate the size of the pelvis, the distance between the sciatic spines is known as the transverse pelvic diameter, the normal value of about 10cm, gynecology is often used to determine the pelvic size of the sciatic spines, combined with the size of the fetus to choose the reasonable way of production. Due to the protrusion of the area, daily sedentary or trauma, may lead to local muscle damage, resulting in localized areas of pain after sitting for a long time, affecting daily life and work, for the need to sit for a long time for workers, you can choose hollow hemorrhoid cushion, can avoid this situation.