Unilateral facet dislocation at the lumbosacral spine

Unilateral facet dislocation of the lumbosacral junction is considered the mildest form of traumatic lumbosacral dislocation. This is an extremely rare injury that can be a diagnostic challenge in an emergency setting, where radiography is often inadequate. CT or MR may be useful for early diagnosis and treatment. Imaging findings in a new case are presented and the usefulness of different imaging methods is reviewed.