An X-ray of the lumbosacral spine involves the 5 lower back (lumbar) vertebrae and the 5 small fused vertebrae (sacrum). The vertebrae are separated by flat pads of cartilage that cushion the vertebrae and allow movement. A myelogram involves X-rays or a CT scan of the spine after dye has been inserted into the spinal fluid. A lumbosacral spine X-ray is one of the most common X-rays involved with a myelogram.

Alternative Names

X-ray - lumbosacral spine; Myelography