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 ...