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3d medical animation health back backbone bone bulge bulged bulges bulging column compression cord cords disc discs epidural extrude extruding extrusion herniated herniation impinged impingement injections management nerve osteoarthritis pain protrude protruding protrusion ruptured spinal spine steroid thecal vertebra vertebrae vertebral Epidural Steroid Injection (Medical Treatment) Epidural Administration nucleus medical media radiculopathy procedure