Establishment and application of biomechanical finite element model after percutaneous vertebral augmentation
WANG Tao
FAN Heng-jun
ZHANG Fu-li
WU Kai
YAO Lei
Abstract：Objective To establish the biomechanical finite element model of patients with spinal compression frac-tures induced by lumbar 2 osteoporosis before and after being treated with bone cement injection , and to observe and comr-pare the stress changes before and after treatment between the sick vertebra and adjacent vertebra .Methods One 70-year-old patient with spinal compression fractures induced by lumbar 2 osteoporosis treated with percutaneous vertebral augmen-tation was randomly selected in our hospital .Bilateral lumbar 2 pedicles were injected with small amount of bone cement . After 2 years of follow-up, the vertebra and adjacent vertebral body had no new fractures , and no local pain .Taking the lumbar CT data of patients before and after treatment as the reference , we established a three-dimensional biomechanical fi-nite element model, and simulated patients'lumbar rotation, flexion and lateral flexion.Then, the stress changes were ob-served and compared before and after treatment between the sick vertebra and adjacent vertebra .Results The three-di-mensional biomechanical finite element model was successfully established .It contained a total of 211 618 element genera-tion, including 20 914 four-node shell elements , 190 107 ten-node elements , and 597 bar units.After the bone cement in-jection, the extension, flexion and lateral bending stress of lumbar 2 vertebra increased (all P<0.05), the stress of verte-bral rotation had no difference as compared with before (P>0.05), and no significant difference was found in the stress of lumbar 1 and 3 vertebral extension, flexion, rotation and lateral flexion before and after treatment (P>0.05).Conclusion The biomechanical finite element model helps to determine the prognosis of patients with spinal compression fractures in -duced by lumbar osteoporosis treated with bone cement injection .
Keywords：lumbar fractureosteoporosisbone cementbiomechanicsthree-dimensional finite element
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 15-17 )