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vertebra. The term means spine slip. This is clearly seen and measurable on routine x-rays. It should not be confused with the chiropractic community's concept of a vertebra being out (without any imaging abnormalities, including x-rays). The typical appearance of spondylolisthesis is one vertebra slipping forward on the vertebra below. Retrolisthesis is a term used to describe when a vertebra is slipping backward on the vertebra below. Lateralolisthesis describes the vertebra that is displaced to the side of the vertebra below. Rotatory listhesis is a degenerative condition where a vertebra rotates on the vertebra below. DIAGNOSIS Routine standing spinal x-rays are the best way to diagnose vertebral malalignment such as spondylolisthesis. Flexion and extension (patient bending forward and backward with maximum effort)
The moving forwards of a vertebra relative to the one under it, most commonly of the 5th lumbar vertebra over the top of the SACRUM. This is due to a congenital weakness (SPONDYLOLYSIS) of the bony arch that bears the facets by which the vertebrae articulate together. Spondylolisthesis causes severe backache on standing and leads to nerve pressure effects.