The normal shape of the male pelvis. About 30% of women share this bony configuration; however, the heart-shaped inlet, convergent sidewalls, slanted sacrum, and narrow sacrosciatic notch pose problems for childbearing. The narrowed dimensions increase the risk of fetopelvic disproportion, obstructed labor, and cesarean delivery.
A female pelvis that has a deep, cone-like shape similar to a typical male pelvis, making it less conducive for the smooth passage of a baby during childbirth.