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Q. Is spinal instability the same as spondylolisthesis?

 

A. Spinal instability refers to a vertebrae and spinal motion segment that is moving too much: either front to back, side to side, or up and down. It can occur with a spondylolisthesis and the terms are often used interchangeably; however, it is important to realize that they are separate problems, and spondylolisthesis does not have to be present to cause spinal instability and vice-versa.