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Abstract Objective Through the three-dimensional finite element method，the advantages and disadvantages of the “F” fixation method and the traditional fixation method were compared in the treatment of femoral neck fracture，in order to provide the most optimal one for clinical application.Methods Using the reverse modeling technology，the bone of normal adult volunteers proximal femur was scanned by CT.Mimics10.0 and Geomagic 2012 software were used to reconstruct the 3D structure of the femur，the femoral neck fracture model (Pauwels angle=70 degrees) was simulated in the Cero3.0，And then the nails were implanted according to the traditional fixation method (the control group) and the “F” fixation method (the experimental group).In Abaqus 6.14，two working conditions，single foot standing and double foot standing，were calculated.Results a) In the control group，the stress was concentrated on the upper end of bolt，the bottom of the two lower screws，and the calcar femorale.In the experimental group，the stress mainly concentrated in the screw，and distributed evenly along the screw to the nail tail and surrounding bone.The stress distribution at the fracture end of the fracture，especially at the calcar femorale.b)Compared with the control group，the experimental group had significantly reduced stress distance (P＜0.01) at the fracture distance of the calcar femorale，reduced total displacement of the femoral head (P＜0.05) and the relative displacement of the fracture end (P＜0.05).Conclusion The shape of “F” technology can not only eliminate the torsional stress and shear stress at the fracture end while maintaining axial compressive stress.The strong oblique nail implantation can form new core pillar in the cantilever structure，thereby effectively reduce the shear stress of fracture that provides good mechanical environment for fracture healing.
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