By David P. Evans MSc (Biomechanics), MD (auth.)
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Extra resources for Backache: its Evolution and Conservative Treatment
Homo may have lived in a sympatric relationship with two forms of Austra/opithecus. From crushed baboon skulls that have been found it appears likely that the australopithecines used instruments of some sort to kill the animals they hunted. Nevertheless they are probably a side-branch of human evolution that remained more or less primitive into the Pleistocene. FROM FOUR LEGS TO TWO 39 The explosion in the size of the human brain has been the subject of many different hypotheses, but Martin (1977) believes that the brain expanded continuously (though not necessarily uniformly) over at least 4 million years.
31. 32. 33. 49 There was a concurrent increase in the cranial capacity and this affected the birth canal, in turn increasing the femoral angle and shortening the femoral neck. In addition to shortening, the iliac crests have rotated forwards. The iliac changes together with the lengthening of the lower spine have provided the means for the trunk to be rotated in man during locomotion. The form of the foot bones also disclose the degree of uprightness of the animal and the presence or absence of a striding gait.
This structural constitution corresponds to a joint of low mobility, like the secondary cartilaginous joints. It is often seen in children and closely resembles that found in the primates. 6 The functional significance of certain vertebrae in maintaining the erect position (from Kapandj i, 1974) man the caudal segment of the articular facet becomes longer and assumes greater significance than the cranial segment. 7) . 8). 7 Variation of angle between two segments of sacral articular facet (from Kapandji, 1974) tubercle is the point of insertion of some powerfulligaments of the saeroiliae joint.
Backache: its Evolution and Conservative Treatment by David P. Evans MSc (Biomechanics), MD (auth.)