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. 2021 Sep 30;18(3):543–553. doi: 10.14245/ns.2040744.372

Fig. 1.

Fig. 1.

Lordosis distribution index (LDI). The LDI is calculated as a ratio between the lower lordosis (L4–S1) and the global lordosis. The LDI should reflect the increasing lordosis towards the lower spinal segments.