ABSTRACT
[Objective]To analyze the factors of post-operative deformity after posterior approach vertebral pedicle fixation in treatment of dorso-lumbar spinal fractures.[Method]Between 2000.10～2005.11,32 patients of single dorso-lumbar spinal fracture were hospitalized.compressive type 5 cases,explosive type 27 cases.T11 12 cases,T12 11 cases,L1 5 cases,L2 3 cases,L3 1 case.The patients were devided into 3 groups according to the severity of related chondral plates injuly,group 1: without chondral fracture 11cases,group 2: with upper chondral plate fracture 15 cases,group 3: with both upper and lower chondral plate fractures 6 cases.By the formula to measure the average height of fractured vertebral body and its kyphotic Cobb's angle before operation,after operation and at time of follow-up,and calculate the result stastically.[Result]All 32 patients were followed-up for 10～56 months(average 23 months).The results indicated that the patient's preoperative condition was negatively correlated with the average vertebral height which is followed-up.The worse condition was,and the greater loss of postoperative vertebral height was.Furthermore,the patient's situation before operation had a positive correlation with the Cobb's angle of vertebral followed-up.When the patient's condition was worse,the postoperative angle of deformity was larger.[Conclusion]Posterior approach vertebral pedicle fixation in treatment of dorso-lumbar spinal fractures may result in reccurence of vertebral deformity,which is related to the severity of injury of vertebra and its chondral plates,so that to those patients related with chondral plates injuries,the vertebral pedicle fixation should be combined with anterior bone grafting,or with bone grafting into vertebral body after reduction.