Fig. 4

K1/k2 and k3/(k2 + k3) at six weeks after PLIF (a and b) and at one year (c and d), for the fusion group (left from the vertical blue line) and for the pseudarthrosis group (right from the vertical blue line) of the control ROIs (endUP_C, inter_C, endLOW_C in red, green and blue respectively) and the operated ROIs (endUP, inter, endLOW in pink, yellow and grey respectively). Statistically significant differences between the groups were depicted by a red asterisk