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The Meyerding classification system is a radiographic system based on the severity of vertebral slippage. Slips are classified as grade 1 through grade 4 based on the percentage of translation of the cranial vertebra on the caudal vertebra. The superior end plate of the caudal vertebra is divided into quarters, and the percentage of slippage is recorded. Slippage of 100% or more is referred to as spondyloptosis. This classification system is frequently used because it is simple and reliable.¹
¹R. Vaccaro MD, Alexander. Orthopaedic Knowledge Update. Rosemont: American Academy of Orthopaedic Surgeons, 2005.