Fig. 4From: Relationship between postoperative lordosis distribution index and adjacent segment disease following L4-S1 posterior lumbar interbody fusionKaplan-Meier analysis of adjacent segment disease (ASD) patients after L4-S1 posterior lumbar interbody fusion during the 120 months of follow-up period by three kinds of lordosis distribution index (LDI) groups. (log-rank test, P = 0.001)Back to article page