The L5 - S1 disc at the very base of the spine is the disc most commonly damaged. (sportsinjuryclinic.net)
Little Hugh Ambrose had managed to manoeuvre himself into such an awkward position that the back of his head battered against the base of my spine with every contraction, making me feel as though someone was smashing my vertebrae with a hammer whilst some other invisible assailant kicked me in the stomach with hobnailed boots. (faith.org.uk)
Epidural Block: A type of anesthesia given through a tube placed in the space at the base of the spine. (acog.org)