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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)
A pars defect of the lumbar spine involves a part of a vertebra called the pars interarticularis. Roughly translated, that means the part between two joints.. A defect in the pars is a break in this portion of bone. This break leads to a separation of the upper, front portion of the vertebra from its lower, back portion. This condition is a precursor to another condition called spondylolisthesis, a word that refers to the slipping of a vertebra.