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Establish the Modles of Thoracolumbar T12-L1 Spines and Investigate the Thoracolumbar T12-L1 Burst Fracture Mechanism Using Finite Element Method

Author: WeiJian
Tutor: MaXun
School: Shanxi Medical
Course: Orthopedics
Keywords: Finite Element Analysis T12 - L1 vertebral body Burst fracture Biomechanics
CLC: R683.2
Type: Master's thesis
Year: 2009
Downloads: 61
Quote: 0
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Abstract


Background: spine fractures are very common fractures , thoracolumbar spine in the physiological curvature of the intersection is the stress concentration at fracture there is more common . Thoracolumbar injury in all spinal injuries accounted for 30% - 60% , despite the burst fracture accounted for only about 15% of all spinal injuries , but the nerve damage caused by burst fractures accounted for 50% - 60% , so the full understanding of burst fracture mechanism for the prevention, mitigation and treatment are very useful. Object: a healthy adult males : a routine physical examination of healthy adult males CT scan data obtained images in DICOM format output and save imported into the 3D reconstruction software Mimics for processing to generate a three-dimensional solid , and The determining unit type gives the material properties . The solid model is then imported into the ANSYS10.0 finite element software to generate three-dimensional finite element model of the thoracic and lumbar . Model validation by the impact load applied vertically on the top of the T12 vertebral body preset uniform density hard plate analysis of the stress distribution of the vertebral body , to explore the mechanism of thoracolumbar burst fractures . Objective: To establish the T12 - L1 vertebral dimensional finite element model , and apply the model to explore the mechanism of T12 vertebral junction in the direction perpendicular to the dynamic impact load thoracolumbar burst fractures . Conclusion : The load applied in the vertical direction to achieve maximum end-plate embedded in the vertebral body , the center of the end plate to withstand the maximum stress , stress concentration with the corresponding center of the cancellous bone connected with the end plate . This may prove a hypothesis : endplate core material into the vertebral body, to continue into the fat and bone marrow of cancellous bone squeezed out . When entering the vertebral body faster than fat and bone marrow extrusion speed , the vertebral body will break through the cortical bone of the front and rear burst . Burst fracture of the cortex , followed by a brief fragments into the position of the spinal canal to be deeper than the final observed position , because in the process of the burst , the fragments will exit the vertebral body . Results : In the vertical direction the applied load , the T12 vertebral body vibration , the maximum load is reached , the end plate embedded in the vertebral body , the center of the end plate to withstand maximum stress , stress concentration and with cancellous bone endplate connection the central portion .

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CLC: > Medicine, health > Surgery > Orthopaedic Surgery ( movement system diseases,orthopedic surgery ) > Fracture,bone damage > Vertebral fractures
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