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Lumbar Spine Injury - Classic Intervertebral Disc Injuries and Degenerative Disc Disease. Accurate medical-legal chart depicting a variety of intervertebral disc injuries. Insets: 1. Normal Anatomy from a superior view; 2. Disc degeneration causing the annulus fibrosis to break down; 3. Disc bulge with nucleus pulposus pushing the disc posteriorly; and 4. Disc herniation with complete tearing of the annulus allowing the nucleus pulposus to ooze out and put pressure on the spinal cord and nerve root.