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An abnormal increase in the forward curvature of the lumbar spine is known as

User Jeriko
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Kyphosis.

Kyphosis is an abnormal forward rounding (more than 50 degrees of curvature) of the spine. In the upper (thoracic) back, kyphosis is commonly due to osteoporotic compression fractures. It can also occur in the lower (lumbar) spine.

User Siewers
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ANWSER : Lordosis

DEFINITION : An abnormal forward curvature of the spine in the lumbar region.
User James Paul Turner
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