Anterolisthesis, also known as spondylolisthesis, is a spine condition in which the upper vertebral body slips forward onto the vertebra below. In some cases, this may lead to your spinal cord or nerve roots being squeezed. This can cause back pain and numbness or weakness in one or both legs. In rare cases, it can also lead to losing control over your bladder or bowels. Spondylolisthesis could be caused by a defective joint, a joint damaged by accident or other trauma, a vertebra with a stress fracture caused from overuse of the joint, or a joint damaged by an infection or arthritis.
Symptoms of spondylolisthesis can include back or buttock pain; pain that runs from the lower back down one or both legs; difficulty walking; leg, back, or buttock pain that gets worse when you bend over or twist; loss of bladder or bowel control, in severe cases.
William Blahd, M.D., Pain Management: Spondylolisthesis, WebMD (July 14, 2017), https://www.webmd.com/back-pain/guide/pain-management-spondylolisthesis