Fig. 2From: Effects of dynamic and rigid implantation on biomechanical characteristics of different sagittal alignment lumbar after single- or double-level spinal fixations: a finite-element modeling studya Front and b lateral views of the FE model of the lumbo-pelvis; four Roussouly’s type models: c type 1 model, d type 2 model, e type 3 model, and f type 4 model. PI: pelvic incidence; PT: pelvic tilt; SS: sacral slope; LL: lumbar lordosis; Apex: the apex of the lordosis; NVL: the number of vertebrae in the lordosisBack to article page