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Cobb's angle for segmental lordosis and whole lumbar lordosis. (A) The segmental lordosis (SL) at L4-5 (a) was defined as the angle subtended by the superior endplate line of L4 and the inferior endplate line of L5. The SL at L5-S1 (b) was defined as the angle subtended by the superior endplate line of L5 and superior endplate line of S1. (B) The whole lumbar lordosis (c) was defined as the angle subtended by the superior endplate line of L1 and superior endplate line of S1.
