How is sagittal balance acquired during bipedal gait acquisition? Comparison of neonatal and adult pelves in three dimensions. Evolutionary implications

Tardieu, Christine; Bonneau, Noémie; Hecquet, J.; Boulay, C.; Marty, C.; Legaye, Jean; Duval-Beaupère, Geneviève

doi:10.1016/j.jhevol.2013.06.002

Cited by 53 publications

(71 citation statements)

References 45 publications

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“…The ischial spines are larger in humans than in nonhuman primates, because they constitute important attachment sites for the ligaments and fasciae forming the pelvic floor (62). The spines and associated ligamentous structures substantially constrain the birth canal dimensions, but they provide support for the abdominal and pelvic organs and contribute to sagittal stabilization of the sacrum (62)(63)(64). Intraabdominal hydrostatic pressure reaches high peak values during walking and running (65), and although that pressure positively influences the stability of the lumbar spine, it results in high strains in the pelvic floor (66).…”

Section: Discussionmentioning

confidence: 99%

Developmental evidence for obstetric adaptation of the human female pelvis

Huseynov

Zollikofer

Coudyzer

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

163

143

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The bony pelvis of adult humans exhibits marked sexual dimorphism, which is traditionally interpreted in the framework of the "obstetrical dilemma" hypothesis: Giving birth to large-brained/ large-bodied babies requires a wide pelvis, whereas efficient bipedal locomotion requires a narrow pelvis. This hypothesis has been challenged recently on biomechanical, metabolic, and biocultural grounds, so that it remains unclear which factors are responsible for sex-specific differences in adult pelvic morphology. Here we address this issue from a developmental perspective. We use methods of biomedical imaging and geometric morphometrics to analyze changes in pelvic morphology from late fetal stages to adulthood in a knownage/known-sex forensic/clinical sample. Results show that, until puberty, female and male pelves exhibit only moderate sexual dimorphism and follow largely similar developmental trajectories. With the onset of puberty, however, the female trajectory diverges substantially from the common course, resulting in rapid expansion of obstetrically relevant pelvic dimensions up to the age of 25-30 y. From 40 y onward females resume a mode of pelvic development similar to males, resulting in significant reduction of obstetric dimensions. This complex developmental trajectory is likely linked to the pubertal rise and premenopausal fall of estradiol levels and results in the obstetrically most adequate pelvic morphology during the time of maximum female fertility. The evidence that hormones mediate female pelvic development and morphology supports the view that solutions of the obstetrical dilemma depend not only on selection and adaptation but also on developmental plasticity as a response to ecological/nutritional factors during a female's lifetime.pelvis | development | evolution | obstetrical dilemma | sex steroids

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Section: Discussionmentioning

confidence: 99%

Developmental evidence for obstetric adaptation of the human female pelvis

Huseynov

Zollikofer

Coudyzer

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

163

143

View full text Add to dashboard Cite

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“…For energy-efficient human bipedal locomotion, however, lordotic angulation of the ilium relative to the ischium, increasing the lever arm of the ischio-crural muscles, was a prerequisite to be able to walk fully upright. 5,12,13 This resulted in an increase in the ischio-iliac angle and pelvic incidence during human evolution. 5,8 This, in combination with the ability to fully extend the hips and knees at the same time, makes man the only species to consistently carry the body's center of gravity straight above the pelvis, rather than in front (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

The Etiologic Relevance of 3-D Pathoanatomy of Adolescent Idiopathic Scoliosis

2017

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Despite many years of dedicated research into the etiopathogenesis of adolescent idiopathic scoliosis, there is still no single distinct cause for this puzzling condition. In this overview, we attempt to link knowledge on the complex three-dimensional pathoanatomy of AIS, based on our ongoing research in this field, with etiopathogenic questions. Evidence from multiple recent cross-sectional imaging studies is provided that supports the hypothesis that AIS has an intrinsic biomechanical basis: an imbalance between the biomechanical loading of the upright human spine due to its unique sagittal configuration on the one hand, and the body's compensating mechanisms on the other. The question that remains in the etiology of AIS, and the focus of our ongoing research, is to determine what causes or induces this imbalance.Keywords: Scoliosis; Etiology; Pathogenesis; Research. RESUMO Apesar dos muitos anos de pesquisa dedicada à etiopatogenia da escoliose idiopática do adolescente, ainda não existe uma única causa distinta para essa afecção intrigante. Nesta visão geral, tentamos fazer a ligação do conhecimento sobre a complexa anatomia patológica tridimensional da EIA, com base em nossas pesquisas em andamento nessa área, com as questões da etiopatogenia da doença. As evidências dos diversos estudos transversais recentes são apresentadas e corroboram a hipótese de que a EIA tem base biomecânica intrínseca: o desequilíbrio entre a carga biomecânica devido à sua configuração sagital única por um lado, e os mecanismos compensatórios

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“…The double S shape of the human spine in sagittal plane is one of the evolutionary adaptations to bipedal locomotion, providing a compromise between stability and mobility [5]. Several quantitative parameters, both positional and anatomic, concerning the sagittal balance have been distinguished [6].…”

Section: Introductionmentioning

confidence: 99%