Lordosis is a type of abnormal curve in the lumbar vertebrae.
A lumbar spine that has an unnatural inward curve is known as lordosis. The typical inward curve of the human spine's lumbar and cervical regions is sometimes referred to as lordosis or lordotic.
Similar to this, the term "kyphosis" originally referred to an abnormal convex curvature of the spine. Kyphosis or kyphotic is another name for the typical outward (convex) curvature in the thoracic and sacral regions. \
The word is derived from the Greek word lordosis ("bent backward"). Humans may more easily bring the majority of their mass over the pelvis because to lordosis in the spine. This enables a walking stride that is far more efficient than that of other primates, whose rigid spines force them to adopt an ineffective forward-leaning "bent-knee, bent-waist" gait.
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