A lumbar disk replacement is a surgical procedure that targets the lower vertebrae in your spine. Vertebrae are spinal bones that are stacked on top of one another, with disks acting as the cushions between them. These disks allow the spine to rotate and move without the vertebrae hitting one another. The lumbar refers to the vertebrae and disks that are located near the bottom of your spinal column. refer to are at the bottom of your spine. Therefore, a lumbar disk replacement involves replacing inserting an artificial disk into the lower part of your spine to replace a natural one that has degenerated. It is considered a major surgery, requiring general anesthesia, surgical equipment, and a hospital stay.