O65.3: Obstructed labour due to pelvic outlet and mid-cavity contraction

In the pelvis there are various pelvic bones. At the back of the body the pelvic bones are connected to the sacrum of the spinal column. There is a joint on either side of the sacrum for this purpose. The pelvic bones plus the sacrum form the bony pelvic ring or girdle. In front, the pelvic bones are tightly joined to one another by ligaments and cartilage fiber.

There are different levels within the pelvis. During the birth the child must pass through the different levels. The child first passes through the pelvic inlet, then the midpelvis, and finally the pelvic outlet. In a normal birth the child passes through the pelvis head first. If the child’s head is to be able to pass through the different levels, it has to turn in different places.

In your case, your midpelvis and your pelvic outlet are too narrow. When the pelvis is too narrow, the child’s head may not be able to pass through certain parts of the pelvis as easily. It may also be that the head is unable to turn as easily as normal.

There were problems during the birth due to your narrow pelvis. Problems like these can make a birth take longer than usual. It may also be the case that the child cannot then be born in the usual way, but that a Caesarean is required.