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The female pelvis contains the baby throughout pregnancy and is modified during delivery to facilitate delivery. Outside of pregnancy and childbirth, the bones that articulate in it are practically fixed but during pregnancy and mainly during labor, the pelvis becomes a more flexible structure, 'deformable' to facilitate the delivery of the baby.
For this reason, the pelvis fulfills a very important mission, both during pregnancy and at the time of delivery. We explain what types of pelvis exist and how they affect childbirth.
We divide the pelvis into 2 regions, the greater pelvis, an area above the innominate line, which is wider and is the first part with which the baby makes contact when it is introduced into the birth canal and the lower or true pelvis, narrower, just below it.
We classify the pelvis depending on the measurements and relationships between the different bone reliefs of the same. The best known of the classifications is that of Cadwell and Moloy, which distinguished 4 types of pelvis, although it must also be taken into account that a large part of the pelvis is of a mixed type, a mixture of those described in this classification:
1. Gynecoid pelvis: It is the most frequent and favorable pelvis for childbirth. The upper strait is oval in shape. Sacrum, pubic arch and sciatic spines normal.
2. Android pelvis: It is the typically male pelvis, the upper narrow is heart-shaped. Sacrum, pubic arch, and ischial spines shorten calving diameters. For this reason, this type of pelvis is not favorable for natural childbirth.
3. Anthropoid pelvis: The most striking feature of this type of pelvis is that the anteroposterior diameters are increased with respect to the transverse ones. It is a very common pelvis among the black race.
4. Platypeloid pelvis: It is the least common pelvis of all, it is flattened and as its main characteristic, it has increasing transverse diameters with respect to the anteroposterior ones.
For the proper progression of the baby through the birth canal, there are other factors of great importance, such as the placement of the presentation, the size, the uterine dynamics ... so having one type of pelvis or another does not necessarily have to be a determining factor. for the birth route.
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