Fig. 6From: Mild (not severe) disc degeneration is implicated in the progression of bilateral L5 spondylolysis to spondylolisthesisColour coded posteroanterior (+) and anteroposterior (−) shear stress distribution in the annulus fibrosus of the L5-S1 disc in the mid discal plane at peak flexion (Fx) and extension (Ex) bending loads of 10 Nm. In both Fx and Ex bending, the mildly degenerate L5-lytic model without any disc height loss recorded the greatest increase in shear stresses from the baseline Intact stateBack to article page