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The scientists say the wide pelvis tells them much about these human ancestors.
Some scientists once suspected that the wide pelvis enabled Neanderthals to carry a child longer than nine months, giving birth to larger, more developed infants.
But the discovery of the wide pelvis suggests that H. erectus had got a head start by growing within the womb – again like modern babies.
The wide pelvis of H. erectus shows that large brains could grow in the womb of early humans long before H. sapiens first emerged on the scene about 195,000 years ago.
Humans are unique for the relatively large heads of their newborn babies but, until now, it was not known when women developed the wide pelvis needed to give birth to big-brained babies.
Instead, "Ardi" walked upright, with a big, stiff foot and short, wide pelvis, researchers report in Science.
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A wider pelvis does not increase locomotor cost in humans, with implications for the evolution of childbirth.
Women, on the other hand, have a wider pelvis and thighbones that more naturally angle in toward the body's midline, rather than away from it.
As GTPS is more common in women, and women have wider pelves than men, 23 the research question of whether a wider pelvis is an intrinsic risk factor for GTPS should be addressed.
Additionally, the anterior flange of the prothesis was modified to include a recessed patellar sulcus and reduced anterior condylar height (to ovoid "overstuffing" during knee flexion) and a lateralized patellar sulcus (to accommodate the increased Q-angle associated with a wider pelvis).
The bodies of females tend to resemble the shape of a pear due to a wider pelvis, the bodies of males tend to resemble the shape of an apple due to a wider ribcage, and the body of a child may be symbolically represented as a mango or a skull by virtue of the way in which the Sun is centered at the helm of the Solar System.
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