Spondylolisthesis is the forward or anterior displacement of one vertebra over another. Backward displacement is referred to as retrolisthesis. Most common is L5 on S1, next most common is L4 on L5.

A hangman's fracture is a specific type where the C2 is displaced anteriorly relative to C3 due to fracture of the C2's pedicles.


By Causes

By Location

By Severity

Meyerding grading of subluxation in the sagittal plane: