Everybody has only one lumbar spine. You may mean six lumbar vertebrae, instead of the normal five. This is an anatomical variation, not in itself e problem.
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There are typically five lumbar vertebrae in a normal adult human spine. The lumbar vertebrae are located in the lower part of the spine, below the thoracic vertebrae and above the sacrum.
Just normal bones
Lumbar lordosis
Slight loss of normal lumbar lordosis is a subjective evaluation by the radiologist of the alignment of the lumbar vertebrae which should form a forward facing curve on the lateral x-ray of the lumbar spine. It is a highly subjective evaluation and for the most part, when slight, can not be inferred to have any specific meaning. A normal lumbar spine may seem to have a slight loss of lordosis. Pain, muscle spasm, arthrosis and a host of other conditions may be associated with the finding.
An average number of spines on a cacti may vary from the species of the cacti. A desert cactus can grow up to 2000 spines without a problem. However, a normal house cactus can only grow up to 800-1000 spines.
The anatomy books show what are normally seen, five vertebra... There are many variants in anatomy, and someone with four lumbar vertebras isn't abnormal, just someone who is a little different, but still normal. You might have something we call a "transitional" vertebra, such as an extra thoracic vertebra merged into a lumbar, or maybe a lumbar vertebra fused with a sacral vertebra... Still normal...
Hyperlordosis
Lumbar lordosis simply means that one's back is curved more than normal. Straightening of the lumbar lordosis is a process in which the back is straightened to be a more natural curve.
The area around the topmost two lumbar vertebrae looks normal.
6
The link should help. It says 10% of adults. I know this because I have the same condition except I wasn't technically an adult when I was diagnosed. I hope the link helped.