An imaging technique used to locate the source of back pain caused by an injured disk. In diskography, a solution is injected into the specific disks believed to be causing pain, as well as into neighboring disks. A special X ray called a diskogram is taken, which is often used before back surgery to identify the exact area to be operated on. Diskography may be more painful than myelography and requires experienced and expert technique for accurate results. Diskograms may be helpful for diagnosing sciatica, as they can reveal the extent of degeneration and damage of the offending disk.