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Degenerative spondylolisthesis (slippage of one vertebra over another) is caused by osteoarthritis of the facet joints. Most commonly, it involves the L4 slipping over the L5 vertebra. It most frequently affects people age 50 and older.
To learn more about Spondylolisthesis, visit AANS.org
Information sourced from https://www.aans.org/Patients/Neurosurgical-Conditions-and-Treatments/Os...