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Table 3 SDSG classification system of lumbosacral spondylolisthesis

From: Reliability and development of a new classification of lumbosacral spondylolisthesis

Slip grade Sacro-pelvic balance Spino-pelvic balance Spondylolisthesis type
Low-grade Normal pelvic incidence -- Type 1
  High pelvic incidence -- Type 2
High-grade Balanced -- Type 3
  Unbalanced Balanced Type 4
   Unbalanced Type 5