Fig. 6From: Finite element analysis after rod fracture of the spinal hybrid elastic rod systemThe von Mises stress distribution on the inner intact nitinol stick (a) (Ns-I) and fractured nitinol stick (b) (Ns-F) during flexion. The NS stress markedly increased on the proximal third in Ns-F group. This phenomenon was compatible with the connecting region of the screw and rodBack to article page