Fig. 1From: Biomechanical study of proximal adjacent segment degeneration after posterior lumbar interbody fusion and fixation: a finite element analysisFour finite element models of the L3-L5 lumbar spine (a) Healthy disc with no fusion (b) Healthy disc with L4-L5 posterior lumbar interbody fusion (c) Mild degenerated disc and L4-L5 posterior lumbar interbody fusion (d) Moderate degenerated disc and L4-L5 posterior lumbar interbody fusionBack to article page