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Meyerding classification of spondylolisthesis. Grade 1 is less than 25% slip, grade 2 is 26% to 50% slip, grade 3 is a 51% to 75% slip, and grade 4 is 76% to 99% slip. The percentage of the slip is determined based on the radiographic measurements (lateral view of the spine) using the formula a/A×100, where a is the distance between the posterior edge of the inferior endplate of the proximal vertebra and the posterior edge of the superior endplate of the vertebral below it and A is the distance between the anterior and posterior edge of the superior endplate of the distal vertebra. (From Patel DR, Greydanus DE, Baker RJ. Pediatric Practice: Sports Medicine. http://www.accesspediatrics.com. Copyright © The McGraw-Hill Companies, Inc. All rights reserved.) Source: SPONDYLOLISTHESIS, LUMBAR, The Color Atlas of Physical Therapy Citation: Shamus E. The Color Atlas of Physical Therapy; 2015 Available at: http://mhmedical.com/ Accessed: May 10, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved