Finite Element Analysis Of Thoracolumbar Fractures In Elderly And Its Clinical Application

Objective:(1)To establishment a three-dimensional finite elementmodel(T12-L2) about elderly thoracolumbar fracture.(2)To investigatethe biomechanical changes in the elderly thoracolumbar fractures andtheir impact on stability.(3)To explore the indications and clinicaleffects about the two Surgical techniques, cross-segment fixation andposterior pedicle screw fixation with transpedicular calcium phosphatebone grafting.Materials and methods:(1)According to the health adult malethoracolumbar vertebra CT data, we use Mimics, E-Feature FEM ModelingSoftware and ANSYS Software to establish a T12-L2spinal function unitsof the three dimensional finite element model. To simulate and analysisthe stress of the thoracolumbar vertebral body. The thoracolumbarfractures in elderly is established on the basis of the model. Using thethoracolumbar fractures in elderly model to compare the two differentSurgical techniques, cross-segment fixation and posterior pedicle screwfixation with transpedicular calcium phosphate bone grafting. Thesimilarities and differences about the model stress distribution undervarious loads are analyzed and compared.(2)Thoracolumbar fractures inelderly patients were retrospectively analyzed in56cases. Allpreoperative and postoperative dates with vertebral compression degree,Cobb Angle of recovery and loss, low back pain symptoms are assessed.Results:(1)The method of posterior pedicle screw fixation withtranspedicular calcium phosphate bone grafting can reduce and dispersethe stress of screw, reduce internal fixation loosening or fracture.(2)Compared with the preoperative, the postoperative degree of vertebralcompression, Cobb angle, VAS scores were improved significantly (P <0.05). Conclusion:1. The method of posterior pedicle screw fixation with transpedicularcalcium phosphate bone grafting can reduce and disperse the stress ofscrew, reduce internal fixation loosening or fracture;2. The postoperative degree of vertebral compression, Cobb angle areimproved. The majority of patients with postoperative neurologicfunctional status and lower back pain recovered well;3. The combination treatment of posterior pedicle screw fixation withtranspedicular calcium phosphate bone grafting was a safe and effectivesurgical technique in reducing and fixing the injured vertebra body,maintaining a good correction effect, reducing internal fixationloosening or fracture. Objective:(1)To establishment a three-dimensional finite elementmodel(T12-L2) about elderly thoracolumbar fracture.(2)To investigatethe biomechanical changes in the elderly thoracolumbar fractures andtheir impact on stability.(3)To explore the indications and clinicaleffects about the two Surgical techniques, cross-segment fixation andposterior pedicle screw fixation with transpedicular calcium phosphatebone grafting.Materials and methods:(1)According to the health adult malethoracolumbar vertebra CT data, we use Mimics, E-Feature FEM ModelingSoftware and ANSYS Software to establish a T12-L2spinal function unitsof the three dimensional finite element model. To simulate and analysisthe stress of the thoracolumbar vertebral body. The thoracolumbarfractures in elderly is established on the basis of the model. Using thethoracolumbar fractures in elderly model to compare the two differentSurgical techniques, cross-segment fixation and posterior pedicle screwfixation with transpedicular calcium phosphate bone grafting. Thesimilarities and differences about the model stress distribution undervarious loads are analyzed and compared.(2)Thoracolumbar fractures inelderly patients were retrospectively analyzed in56cases. All preoperative and postoperative dates with vertebral compression degree,Cobb Angle of recovery and loss, low back pain symptoms are assessed.Results:(1)The method of posterior pedicle screw fixation withtranspedicular calcium phosphate bone grafting can reduce and dispersethe stress of screw, reduce internal fixation loosening or fracture.(2)Compared with the preoperative, the postoperative degree of vertebralcompression, Cobb angle, VAS scores were improved significantly (P <0.05).Conclusion:1. The method of posterior pedicle screw fixation with transpedicularcalcium phosphate bone grafting can reduce and disperse the stress ofscrew, reduce internal fixation loosening or fracture;2. The postoperative degree of vertebral compression, Cobb angle areimproved. The majority of patients with postoperative neurologicfunctional status and lower back pain recovered well;3. The combination treatment of posterior pedicle screw fixation withtranspedicular calcium phosphate bone grafting was a safe and effectivesurgical technique in reducing and fixing the injured vertebra body,maintaining a good correction effect, reducing internal fixationloosening or fracture.