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Table 1 French classification system for lumbar DS

From: Comparison of the French and CARDS classifications for lumbar degenerative spondylolisthesis: reliability and validity

Definition Type 1 Type 2 Type 3 Type 4 Type 5
SL Preserved SL (> 5°) Decreased SL (< 5°) Decreased SL (< 5°) Decreased SL (< 5°)
LL Preserved LL (LL > PI-10°) Preserved LL (LL > PI-10°) Decreased LL (LL < PI-10°) Decreased LL (LL < PI-10°)
PT PT < 25° PT > 25°
Sagittal balance Balanced (SVA < 4 cm) Balanced (SVA < 4 cm) Balanced (SVA < 4 cm) Balanced (SVA < 4 cm) Sagittal unbalance (SVA > 4 cm)
  1. Note: SL segmental lordosis, LL lumbar lordosis, PI pelvic incidence, PT pelvic tilt, SVA sagittal vertical axis