Back or leg pain can come from several different conditions, so accurately diagnosing the reason for the pain is critical for a proper treatment plan. A discogram is a diagnostic procedure which helps to determine if your back or leg pain is related to a degenerative vertebral disc. By injecting dye into specific vertebral discs to recreate the pain, the discogram allows the physician to view your disc and locate the pain source. If you feel pain when the dye is injected, it is likely that the disc is the source of your pain. If you don’t feel the same kind of pain, your physician will explore other possible causes of your pain in order to diagnose and develop an appropriate treatment plan accurately.