| Abstract:Objective：To explore the correlation between the location, range and degree of lumbar disc degeneration (LDD) and sagittal parameters of spino pelvic alignment. Methods：The clinical data of 76 patients with lumbar disc degeneration (lumbar disc herniation and degenerative lumbar instability) who underwent surgery from January 2013 to December 2015 were retrospectively analyzed. Full length radiographs of the spine were taken to evaluate thoracic kyphosis (TK), lumbar lordosis (LL), sacral slope (SS), pelvic incidence (PI), pelvic tilt (PT), and sagittal vertical axis (SVA). The correlational analysis was carried out between the location, range and degree of lumbar disc degeneration and spino pelvic sagittal parameters. Results：Age was related to location (r＝-0.358, P＜0.01), range (r＝0.329, P＜0.01), degree (r＝0.452, P＜0.01). PI was related to degeneration location (r＝-0.257, P＜0.05). SVA was related to degeneration range (r＝0.304, P＜0.01) and degeneration degree (r＝0.353, P＜0.01).The value of degeneration location in patients with PI≤50° was 4.14±0.64, yet the value in patients with PI＞50° was 3.57±1.08 (P＜0.05).Conclusions：The location of lumbar disc degeneration are correlated with spino pelvic sagittal parameters. PI is an important factor affecting the location of lumbar disc degeneration. The population with PI≤50°are more likely to develop lumbar disc degeneration in L4/5 and L5/S1 discs, while the population with PI＞50°are more likely to develop lumbar disc degeneration in L3/4 and L4/5 discs. |