Table 1 French classification system for lumbar DS
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) |