Discography and back pain

Discography is an imaging test employed to assess back pain and decipher abnormal disc in the spine which causes the pain. When back pain persists despite medication and physical therapy, discography is recommended. Discography confirms the disc's participation in back pain, following which disc related issues such as bulges and degeneration are probed.
Discography also known as discogram, which is generally safe, has its own complications which include infection, increase in chronic back pain, head ache, injury to nerves or blood vessels around the spine and allergic reaction to the dye. However such complications might be averted by following doctor's recommendations in medication and diet before and after discography.
Discography is not a routine test though and is conducted to analyse possibilities of spinal disc surgery and determine the disc levels which are to be treated.