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Maximum shear stress contour of the L3-L4 under flexion situation: (A) layer 1&2 in model 1; (B) layer 3&4 in model 1; (C) layer 5&6 in model 1; (D) layer 7&8 in model 1; (E) layer 1&2 in model 3; (F) layer 3&4 in model 3; (G) layer 5&6 in model 3; (H) layer 7&8 in model 3; (I) layer 1&2 in model 4; (J) layer 3&4 in model 4; (K) layer 5&6 in model 4; (L) layer 7&8 in model 4; (M) Comparison of annulus maximum shear stress of all layers for all four models.
