Finite Element Analysis of Force-Multiplying Bridge Structure Applied in Screw Internal Fixation for Distal Radius Type C Fractures

Objective , To analyze the biomechanical performance differences between the Force-Multiplying Bridge structural screw fixation system (a screw arrangement configuration derived from truss elements) and the traditional plate-screw fixation system in the treatment of distal radius type C fractures using finite element analysis. Methods , Three-dimensional models of distal radius type C fractures were constructed from radial CT image data using Mimics, Geomagic Wrap, and SolidWorks software. Two groups were established: the plate-screw group and the Force-Multiplying Bridge group. In the Force-Multiplying Bridge group, 6 screws were used to construct a triangular truss support system. Finite element analysis was performed using ANSYS software. Results , Under the axial loading condition, the plate-screw group is slightly superior to the Force-Multiplying Bridge group. Under the rotational working condition, the maximum displacement of the Force-Multiplying Bridge group was significantly better than that of the plate-screw group, showing superior anti-torsion performance. Under the palmar flexion/dorsal extension working conditions, the displacement of the plate-screw group was smaller than that of the Force-Multiplying Bridge group. The articular surfaces of the plate-screw group showed a cracked pattern under axial, palmar flexion, and dorsal extension working conditions, while no obvious separation of the articular surfaces was observed in the Force-Multiplying Bridge group under all working conditions. Conclusion , The Force-Multiplying Bridge structural screw fixation system not only achieves performance comparable to that of the traditional plate-screw system but also exhibits significant advantages in terms of articular surface fixation.