Profile, Diagnosis & Treatment for Spondylolysis & Spondylolisthesis Spondylolysis is a condition in which the there is a defect in a portion of a vertebrae called the pars interarticularis (a small segment of bone joining the facet joints in the back of the spine). With the condition of spondylolisthesis, the pars interarticularis defect can be on … Continue reading Spondylolysis and Spondylolisthesis