What four things should be used to describe every spondylolisthesis?

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The four things you describe a spondylolisthesis with are level, direction, degree, and due to. Level tells which vertebral level is slipping (for example, L5–S1). Direction indicates how the slip occurs, most often anterior (anterolisthesis) or posterior (retrolisthesis). Degree measures how far the upper vertebra has moved over the lower one, usually in percent slip or millimeters. Due To states the cause or etiology of the slip, such as dysplastic, isthmic, degenerative, traumatic, pathological, or iatrogenic. This combination gives location, orientation, severity, and cause, which are all essential for understanding and managing the condition. The other options use nonstandard terms like translation or size, or swap in etiology in a form that isn’t the preferred phrasing in this context.