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Vertebral Bodies or Discs: Which Contributes More to Human-like Lumbar Lordosis
Clinical Orthopedics and Related Research, 11/10/09

Been E et al. – The observations suggest the transition from pronograde to orthograde posture (ie, the lordosis angle) resulted mainly from an increase in vertebral body wedging and only in small part from the increase in wedging of the intervertebral discs.

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Ella Been, 11/11/09

The similarity in the wedging of the intervertebral disks of the humans and the macaques suggests some similarity between the mechanical demands placed on the presacral spines of the two species, further supporting the use of macaques as models of the human condition. If this difference between extant primates with different locomotor regimes is reflective of the transition in locomotion style during human evolution, erect posture may leave an accurate record in lumbar vertebral bodies.