A discography, or discogram, is a diagnostic injection procedure that identifies the cause of a patient's back pain. The procedure is typically performed on individuals who have not responded to extensive, conservative treatment regimens. A discography may also be used for surgical planning. This diagnostic procedure pressurizes spinal discs with a sterile liquid to induce pain. If pain is felt during the procedure, the source of the pain will have been located and a treatment plan will be determined shortly after.