Sacroiliitis is one potential cause of SI joint dysfunction. Your sacroiliac (SI) joints are where your spine (sacrum) and pelvis (iliac) connect. Your sacrum is the triangle-shaped bone at the ...
The lumbar region is located between the thoracic (chest) region of the spine and the sacrum, a large bone at the base of the spine. The lumbar spine usually curves slightly inward, called lordosis.
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