Spondylolisthesis describes the anterior displacement of a vertebra or the vertebral column in relation to the vertebrae below. It was first described in 1782 by Belgian obstetrician, Dr. Herbinaux. He reported a bony prominence anterior to the sacrum that obstructed the vagina of a small number of patients. The variant "listhesis", resulting from misdivision of this compound word, is sometimes applied in conjunction with scoliosis. These "slips" occur most commonly in the lumbar spine.
A hangman's fracture is a specific type of spondylolisthesis where the C1 vertebra is displaced anteriorly relative to the C2 vertebra due to fractures of the C2 vertebra's pedicles.
This condition usually does not need treatment. Usually it is simply found on the films and something else, on the condition list, is actually causing the problem