The Characteristics And Clinical Significance Of Sagittal Spinopelvic Parameters In Young Military Patients With L5 Spondylolysis

Purpose:To compare sagittal spinopelvic parameters in young military patients with L5 spondylolysis to those in age-matched military patients without spondylolysis and investigate the characteristics and clinical impact of sagittal spinopelvic parameters in patients with L5 spondylolysis. To investigate the relationship between sagittal spinopelvic parameters and the degree of slip in patients with L5 isthmic spondylolisthesis.Methods:From September 2010 to December 2015, a total of 50 male soldier patients with L5 spondylolysis were divided into the study group. Fifty age-matched patients without spondylolysis were divided into the control group. Standing lateral films that included both hip joints were obtained for each subject. Pelvic incidence(PI), pelvic tilt(PT), sacral slope(SS), lumbar lordosis angle(LL), lumbosacral angle(LSA), and sacral table angle(STA) were measured in both groups. A comparative study of the sagittal spinopelvic parameters of these two groups was performed. Measure the slipping percentage of L5 to investigate the relationship between sagittal spinopelvic parameters and the degree of slip in patients with L5 isthmic spondylolisthesis.Results:There were no significant differences between the two groups in age, gender, height,weight and body mass index. Among the aforementioned spinopelvic parameters, PI, SS and STA were significantly different between patients with spondylolysis and those without spondylolysis(P<0.05). PI and SS were higher in the spondylolysis group than in the control group, but STA was lower in the spondylolysis group than in the control group.The degree of slip was significantly correlated with PI, SS and STA. The PI and SS showed a positive correlation with the degree of slip, but the STA showed a negative correlation with the degree of slip.Conclusions:1. PI and SS were higher in the patients with L5 spondylolysis in those withoutspondylolysis, but STA was lower in the spondylolysis group than in the control group.Higher PI, SS and lower STA are important etiologic factors in young adult patients with L5 spondylolysis.2. PI, SS, STA were significantly correlated with the incidence and degree of L5 isthmic spondylolisthesis. The degree and risk of L5 isthmic spondylolisthesis increase with an increase in PI and SS, and with a decrease in STA.