Analysis Of Risk Factors Of Adjacent Segmental Degeneration After Posterior Lumbar Fusion

Objective: To investigate the risk factors of adjacent segment degeneration(ASDis)after posterior lumbar fusion.Methods: A total of 675 patients with lumbar degenerative diseases who underwent posterior lumbar fusion surgery in the Department of Spinal surgery of the first affiliated Hospital of Xinjiang Medical University from 2010 to 2013 were collected.among them,35 patients who had developed ASDis and received conservative or reoperation treatment during the follow-up to December 2018 were divided into ASDis group and non-ASDis group according to age and sex.The clinical and imaging data of patients in the two groups were collected before operation and during follow-up or retreatment.the follow-up data of the two groups included sex,age and Life satisfaction.Measurement of the following spinal and pelvic parameters by Surgimap image analysis software(PT,PI,LL,SS before and after surgery in the two groups).Two groups of follow-up data were collected including gender,age,fusion segment,Take the above data as the independent variable and the occurrence of ASDis as the dependent variable,An intergroup univariate analysis related to ASDis was performed.Results: Univariate analysis showed that preoperative PT > 25.61° and PI > 56.98° were closely related to ASDis in the ASDis group.Conclusion: in the treatment of lumbar degenerative diseases by posterior lumbar fusion surgery,patients with preoperative PT > 25.61° and PI >56.98° have a higher risk of postoperative ASDis.Clinicians should select appropriate surgical methods according to the spinal parameters measured before surgery,so as to reduce the occurrence of postoperative ASDis.