Hyperlordosis is commonly described as an increase in the normal lordotic lumbar curve leading to an increased anterior tilt and hip flexion.
First of all to I will explain a couple of points about the spine.
The human spine as we all know is formed by a series of curves from the head down to the coccyx (tail bone). First we have the neck, the cervical curve, formed of 7 vertebrae. Next we have the chest, the thorax along with the ribs, formed of 12 vertebrae. Next is the lower back, the lumbar region, formed of 5 vertebrae. Finally we have the two sets of fused bones the sacrum (comprised of 5 fused bones to make one unit) at the base of our spine and the much smaller coccyx (comprised of 4 fused bones and also known as our tail bone since it is the last vestige of the tail that our evolutionary ancestors possessed).
Each section of the spine forms a curve with the section below being a curve in the opposite direction to the one above. So the cervical curve is an anterior curve (towards the front) with the thorax being a posterior curve (towards the back), the lumbar is anterior with the sacral/coccyx curve being posterior again.
Both the anterior curves, the cervical and lumbar curves are termed secondary or lordotic curves. Both the posterior curves the thorax and sacrum/coccyx are termed primary or kiphotic curves.
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