The lumbar vertebrae are the largest movable bones of the backbone. Their large size and bone strength is necessary because these vertebrae support more weight than the upper two segments of the ...

Spondylolisthesis (pronounced spahn-duh-low-liss-thee-sus) is a condition in which one of the bones in your spine (the vertebrae) slips out of place and moves on top of the vertebra next to it. It ...

Anterolisthesis is an atypical alignment of bones in the spine, usually affecting the lower back. It occurs when an upper vertebra slips forward on the one below, leading to pain and other symptoms.