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A species' Odyssey: evolution of obstetrical mechanics from Australopithecus Lucy to nowadays.

Eur J Obstet Gynecol Reprod Biol. 2014 Oct;181:316-20. doi: 10.1016/j.ejogrb.2014.08.027. Epub 2014 Aug 28.

Chene G1, Tardieu AS2, Trombert B3, Amouzougan A4, Lamblin G5, Mellier G5, Coppens Y6.
Author information 1Department of Gynecology and Obstetrics, CHU of Saint-Etienne, 42023 Saint-Etienne, France; Department of Gynecology, HFME, CHU of Lyon, 69000 Lyon, France. Electronic address: chenegautier@yahoo.fr.2Department of Gynecology and Obstetrics, Hospital of Firminy, Firminy, France.3Department of Medical Information, CHU of Saint-Etienne, Saint-Etienne, France.4Department of Rheumatology, CHU of Saint-Etienne, Saint-Etienne, France.5Department of Gynecology, HFME, CHU of Lyon, 69000 Lyon, France.6Department of Paleoanthropology, Collège de France, Paris.
Eur J Obstet Gynecol Reprod Biol
ABSTRACT
AbstractOBJECTIVE: Study of obstetrical mechanics of Australopithecus Lucy, Homo neanderthalensis and Homo erectus relative to modern Homo sapiens and the Catarrhines.STUDY DESIGN: The material comprised a total of 360 pelves: 3 fossil pelves reconstructed using casts (Australopithecus afarensis Lucy or AL 288-1, Homo erectus KNM-WT 15000, H. neanderthalensis or Kebara 2), 305 female modern adult pelves and 52 female Catarrhine pelves (29 gorillas, 18 chimpanzees, 5 orang-utans). All these pelves were reconstructed in order to carry out 11 pelvimetric measurements. Each measurement was carried out twice and by two different operators.RESULTS: The pelvis of Lucy was platypelloid at each pelvic plane. The pelvic inlet of H. neanderthalensis was anteroposteriorly oval whereas the midplane and the outlet were transversely oval. The pelvis of H. erectus was globally round. In modern women, the inlet was transversely oval. The pelvic midplane and outlet were anteroposteriorly oval. In the great apes, the shape of all three pelvic planes was anteroposteriorly oval. The discriminating value of the various pelvimetry measurements place Australopithecus Lucy, H. neanderthalensis Kebara 2, and H. erectus KNM-WT 15000 close to modern humans and less similar to the great apes.CONCLUSION: Obstetrical mechanics evolved from dystocic delivery with a transverse orientation in Australopithecus to delivery with a modern human-like rotational birth and an increase in the anteroposterior diameters in H. erectus, H. neanderthalensis and modern H. sapiens.Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.
Full Text Source: Elsevier Science
PMID:25216347 | http://www.ncbi.nlm.nih.gov/pubmed/25216347

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