DC。 Inner diameter of sacrum, that is, diagonal diameter; The distance from the lower edge of pubic symphysis to the midpoint of the upper edge of sacral promontory is 12.5- 13cm.
IC。 The diameter between iliac ridges, the widest distance between the outer edges of bilateral iliac ridges, is 25-28cm.
European Community. The external diameter of sacrum, the distance from the subspinous process depression of the fifth lumbar vertebra to the midpoint of the upper edge of pubic symphysis, is 18-20cm.
To. The normal value of the diameter between ischial tubercles and the distance between the medial edges of bilateral ischial tubercles is 8.5-9.5 cm.
Note: Normal values are for reference only and may vary from hospital to hospital.