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Pelvimetry is the measurement of the female pelvis. [1] It can theoretically identify cephalo-pelvic disproportion, which is when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal. However, clinical evidence indicate that all pregnant women should be allowed a trial of labor regardless of pelvimetry results.
The term, obstetrical dilemma, was coined in 1960, by Sherwood Larned Washburn, a prominent early American physical anthropologist, in order to describe the evolutionary development of the human pelvis and its relation to childbirth and pregnancy in hominids and non-human primates. [6]
The shape of the posterior muscular and adipose tissues seems to correspond with the general pelvic morphology. The classification is as follows the gynecoid pelvis corresponds to a round buttocks shape, the platypelloid pelvis to a triangle shape, the anthropoid pelvis to a square shape and the android pelvis to a trapezoidal gluteus region. [8]
The step lengthens as the pregnancy progresses, due to weight gain and changes in posture. On average, a woman's foot can grow by a half size or more during pregnancy. In addition, the increased body weight of pregnancy, fluid retention, and weight gain lowers the arches of the foot, further adding to the foot's length and width.
Being upright during labour and birth can increase the available space within the pelvis by 28–30% giving more room to the baby for rotation and descent. There is also a 54% decreased incidence of foetal heart rate abnormalities when the mother is upright. [ 9 ]
Modern humans have morphologically evolved to survive as bipeds, however, bipedalism has resulted in skeletal changes that have consequently narrowed the pelvis and the birth canal. [13] The combination of increased brain size and changes in pelvic structure are the major contributors of obstructed labor in modern humans.
[2] [3] In their edited collection, Childbirth and Authoritative Knowledge: Cross-Cultural Perspectives, Robbie E. Davis-Floyd and Carolyn F. Sargent praised the book for focusing "anthropological attention on childbirth as a subject worthy of in-depth ethnographic fieldwork and cross-cultural comparison, and that inspired many others to enter ...
[2] [6] Betty-Anne Daviss ("Heeding Warning from the Canary, the Whale, and the Inuit: A Framework for Analyzing Competing Types of Knowledge about Childbirth") brings North America into the discussion with a focus on birth in the Inuit community in Canada and how traditional practice has been changed by the building of birth centers.