Finite element study on two kinds of bone grafting methods for the treatment of first lumbar vertebral burst fracture
Chinese Journal of Clinical Anatomy ›› 2016, Vol. 34 ›› Issue (1) : 91-95.
Finite element study on two kinds of bone grafting methods for the treatment of first lumbar vertebral burst fracture
Objective To construct a finite element model(FEM) of first lumbar vertebral burst fracture, and compare the stress distributions between transpedicular grafting and transcanal grafting. Method The FEM of normal thoracolumbar segment T12~L2 with first lumbar vertebral burst fracture was established through thin layer CT scan, three-dimensional reconstruction by using Mimics and ANSYS software, respectively. The model was fixed by the posterior pedicle screws. On the basis of the models, we subsequently generated another 2 models simulating 2 types of surgical techniques, transpedicular grafting (TPG) and transcanal grafting(TCG). The stress distribution of model was observed in the respective 4 models when spine was exposed to a stress of 350N/8Nm in the position of flexion, extension，lateral bending and rotation. Results Through the static analysis of Ansys software, it was concluded 4 model under various conditions of equivalent stress nephogram, and display the equivalent stress peak, flexion: 6.89, 54.10, 8.03, 5.92 MPa; extension: 56.70, 109.00, 12.50, 8.61 MPa; lateral bending: 6.83, 47.50, 11.30, 3.60 MPa; rotation: 23.80, 112.00, 13.10, 7.65 MPa. Not concentrated stress at the time of bone graft screw of the tail and connecting rods, stress significantly decreased after bone graft, assuming a scattered distribution to the central screw. Conclusion Both of the 2 types of grafting procedure/technique can reconstruct the strength of injured vertebrae and enhance the instant stability. Nevertheless, the technique of transcanal grafting may offer a better mechanical performance through decreasing the stress on the internal fixation in a more adequate and efficient way. Therefore this study concludes that it is a better surgical technique worth of being popularized in clinic.
Thoracolumbar / Burst fracture / Bone grafting / Finite element
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