Finite element analysis of the effect of different configurations of internal fixation screws on the treatment of femoral neck fractures
Using finite element analysis method,the biomechanical differences between traditional solid screws and low-stiffness cannulated screws in Pauwels Ⅱ femoral neck fractures were investigated,and insights for the clinical application of low-stiffness cannulated screws were provided.Based on the two-dimensional CT image data of an elderly male volunteer with femoral neck fracture,the femoral three-dimensional model was reconstructed using Mimics software,followed by smoothing and noise reduction using Geomagic software.Subsequently,three-dimensional models of two internal fixation screws were established using Solidworks software and assembled with the femoral fracture model.Finally,the finite element models were established and analyzed using Abaqus software in actual biomechanical conditions of single-leg standing in applied loads and boundary conditions.The results show that the standard deviations of stress peaks on the fixation models using cannulated and solid screws are 12.71 MPa and 85.34 MPa,respectively,while the stress peaks at the distal femur are 78.72 MPa and 79.64 MPa,the overall displacement peaks of the femur are 2.020 mm and 2.086 mm,and the stress peaks on the fracture surface are 216.4 MPa and 210.2 MPa,respectively.Cannulated screws lead to a more uniform stress distribution among multiple screws,enhancing screw load-bearing capacity and fatigue life.The femurs fixed with cannulated screws exhibit smaller stresses and displacements,indicating superior stability.Furthermore,the use of cannulated screws results in a slight increase in stress near the fracture site,promoting fracture healing.
femurfemoral neck fracturecannulated screwsolid screwfinite element analysisbiomechanics
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