Fig. 3From: Mild (not severe) disc degeneration is implicated in the progression of bilateral L5 spondylolysis to spondylolisthesisMid-discal plane projections of the L5-S1 interpedicular travel (IPT) vector in flexion (Fx) and extension (Ex) bending at peak load of 10 Nm. Compared with the INTACT state, the greatest increase in mid-discal plane IPT projections in Fx and Ex was observed in the mildly-degenerate lytic defect model (M-DEG-LYTIC)Back to article page