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The Lumbar Spine

By Anne Asher, About.com

Updated June 13, 2005

About.com Health's Disease and Condition content is reviewed by our Medical Review Board

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The Lumbosacral Joint or L5-S1

The lumbar spine rests upon the sacrum. The place where they meet is called the lumbosacral joint, or L5-S1.

The L5-S1 junction is where the injury spondylolisthesis occurs.

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