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Sagittal parameters of degenerative spondylolisthesis. (A) Slip percentage (SP) was measured as a percentage of the distance from the posterior border of the caudal vertebra to the posterior border of the cephalic vertebra (a), normalized to the superior endplate diameter of the caudal vertebra (b); SP = a/b × 100%; (B) slip angle (SA) was measured by Cobb's angle between the inferior endplate of the cephalic vertebra and superior endplate of caudal vertebra.
