The following pelvic diameter measurements are normal: (20 19 Jiangsu Provincial Hospital Suqian Branch (Suqian First People's Hospital) Recruitment 93 Announcement -3-)

The diameter between iliac spines is the distance between the outer edges of the anterior superior iliac spines on both sides, and the normal value is 23 ~ 26 cm. The diameter between iliac ridges is the widest distance from the outer edge of bilateral iliac ridges, and the normal value is 25 ~ 28 cm. The external diameter of sacrum is the distance from the subspinous process depression of the fifth lumbar vertebra to the midpoint of the superior margin of pubic symphysis, and the normal value is 18 ~ 20 cm. The diameter between the ischial tubercles, also known as the outlet transverse diameter, is the distance between the inner edges of two ischial tubercles, with a normal value of 8.5 ~ 9.5 cm and an average value of 9cm.