Analysis Of Reloss Of Vertebral Height After Thoracolumbar Fracture Internal Fixation And Related Influencing Factors

Objective:Investigate the reloss of vertebral body height and related factors after the reduction and internal fixation of thoracolumbar fracture with pedicle screw system.Methods:From January 2010 to December 2017,a total of 215 patients with thoracolumbar fractures and complete information who were admitted to our hospital for thoracolumbar fractures and treated with posterior pedicle screw system reduction and internal fixation were retrospectively analyzed.General information of patients(age,gender,weight,height),Osteoporosis Self-assessment Tool for Asians(OSTA),number of fractured vertebral bodies,fracture type,preoperative vertebral compression degree,preoperative sagittal Cobb Angle,injured vertebral screw placement,vertebral reduction degree and other related factors were calculated.The incidence of postoperative vertebral height reloss and the degree of vertebral recompression were observed.Univariate and multivariate Logistic regression analysis was used to investigate the correlation between the above factors and vertebral height reloss.Results:Among the 215 patients,86 patients experienced postoperative vertebra height reloss,with an incidence of 40%.There was no significant correlation between age,gender,BMI,preoperative sagittal Cobb Angle,fracture type,injured vertebral screw placement and postoperative vertebral height reloss(P>0.05).The OSTA index,preoperative vertebral compression degree,and vertebral reduction degree were significantly correlated with the occurrence of postoperative vertebral height reloss(P<0.05).Conclusion:The incidence of vertebral height loss after internal fixation for thoracolumbar fractures is high;the OSTA and the preoperative degree of vertebral compression may be the main reasons for the above problems.The Optimum prediction point of OSTA and preoperative vertebral compression degree for postoperative vertebral height reloss are 1.7 and 31.3%.