Spinal anesthesia involves the injection of a medicine into the
canal around the spinal cord. It is used to numb the body below and sometimes above the site of injection.
The area where the needle will be inserted is first numbed with a
local anesthetic, then the needle is guided into the spinal canal and the
anesthetic is injected. The person may not be able to move his or her legs
until the anesthetic wears off.