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Understanding the lumbar spines architecture (e.g.degree of lordosis) is of clinical importance as it is among the central risk factors for disc herniation.Vertebral wedging is strongly associated with lumbar lordosis, yet, what dictates the degree of lordosis and how it is developed is still a controversial issue.We hypothesized, following Hueter-Volkmanns principle, that sacral inclination dictates lordotic angle via differential growth of the posterior part of the vertebral body relative to the anterior, i.e.producing a wedged-shape vertebrae.