In Meyerding classifications, Grade II spondylolisthesis corresponds to which range of translation?

• A. 0-25%
• B. 26-50%
• C. 51-75%
• D. 76-100%

Answer: (B)

The concept being tested is how Meyerding grades spondylolisthesis by the percent translation of forward slip on a lateral view. In this system, you measure how far the upper vertebral body has moved forward relative to the one below, expressed as a percentage of the width of the lower vertebral body. Grade II corresponds to a slip of 26% to 50% of that width, meaning the forward displacement is more than a small slip but less than half of the inferior body's width. This places it above minimal slip (Grade I) and below moderate to severe slips (Grade III and beyond). On imaging, you determine the translation by comparing the anterior slip distance to the width of the inferior vertebral body and converting that into a percentage.