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Medically reviewed by Dr. Brian Paris, D.C on Jan. 20, 2019. Spondylolisthesis ("spon-dee-low-lis-thee-sis”) is a big fancy word that simply means a vertebra in your spine has slipped out of position. It sounds like a pretty extreme condition. And spondylolisthesis can be the source of severe back pain, usually in the lo … Read More