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Herniated Disc - L4-5 Lumbar Discogram. Shows the surgeon placing needles in the lumbar spine. These steps of the procedure are shown: 1. Discography needles are placed into intervertebral discs in the lumbar spine; 2. A needle is entered into the nucleus pulposus of the L4-5 intervertebral disc; 3. Contrast material is injected to recreate spinal nerve impingement pain. Displays the position of the nerves, identifying the level of injury.