Correlation Analysis Between Isthmic Lumbar Spondylolisthesis And Changes Of Sagittal Parameters

Objectives: To evaluate the patients 'changes of sagittal parameters and relationship with isthmic lumbar spondylolisthesis.In order to improve effectiveness and quality of life.Methods: A retrospective analysis was made on complete imaging data of 56 patients with single L5 lumbar spondylolisthesis between January 2013 and January 2016.There were 19 males and 37 females,aged 27-77 years(mean,51.23±13.31years).According to Meyerding degree,there were 31 cases of grade I as first group,25 cases of grade II as second group.Meanwhile,60 normal adults as control group.There were 24 males and 36 females with mean age of 54.40±12.28 years(range,32-74 years).Parameters as pelvic incidence(PI),sacral slope(SS),lumbar lordosis(LL),pelvic tilt(PT),sagittal vertical axis(SVA),slip distance(SD),lumbar slip angle(LSA),slipping percentage(SP)were measured on the standing full length lateral X-ray films of spine and pelvis.Based on the Independent –samples T test,the difference in sagittal parameters between IS group and control group was analyzed.Relationship of all parameters were assessed by the Pearson correlation analysis.Results: Comparing to control group,the patients with isthmic spondylolisthesis have higher PI,PT,LL,SS,SVA(P<0.05).While,PI,PT,LL,SS,SD and SP in first group were significantly increased(P<0.05).There was a positive correlation between SD and PI,PT,SS,LL,LSA,SP(P<0.05).SP was observed to be significantly correlated with LSA and SD(P < 0.05).Conclusion: The sagittal parameters as PI,PT,SS and LL were significantly increased in the patients with isthmic spondylolisthesis than normal,while positive interrelated with slipping percentage.There is a interplay between the isthmic lumbar spondylolisthesis and the changes of sagittal parameters.In addition to the reduction,preoperative morphological evaluation and operative parametric restoration of sagittal plane should be paid attention to.