- 期刊
Biomechanical Analysis of Volar and Dorsal Double Locking Plates for Fixation in Comminuted Extra-articular Distal Radius Fractures: A 3D Finite Element Study
並列摘要
The effects of fracture type, fixation approach, and postoperative functional load factors on the biomechanical interactions in extra-articular distal radius fractures are investigated using three-dimensional (3D) finite element (FE) analysis. 3D distal radius fracture FE models with dorsal wedge, metaphyseal, and volar wedge fractures and volar plating (VP) and dorsal double plating (DDP), respectively, are constructed based on computed tomography images. After model verification and validation, the interface between the fixation plates and the bony surface is simulated using frictional (contact) elements. The von Mises stress distribution and displacements at the radius end are observed under axial, bending, and torsion load conditions. The simulation results indicate that the stress in the bone and fixation plates is higher under bending and torsion loading than under axial loading. The stress values for the bone and fixation plates with DDP fixation are generally lower than those obtained with VP fixation (bone stress is around 31-53% lower and plate stress is around 75% lower). The total displacements of the fracture site with DDP fixation are on average 87.5% lower than those obtained with VP fixation. Postoperative bending and torsion loads should be avoided as much as possible to decrease the stress on the bone and fixation plates. DDP fixation provides better mechanical strength compared to that of VP fixation, decreasing the risk of displacement and stress concentration for distal extra-articular radius fractures.
延伸閱讀
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