Are Spondylolisthesis and Spondylolysis same?
Spondylolysis and Spondylolisthesis are different but related conditions. Spondylolysis comes first but not always. Spondylolysis is a breakdown or fracture of the vertebral structure called pars interarticularis. Spondylolisthesis is slipping forward of the vertebral body, where pars interarticularis is separated and the vertebral body moves out of position.