Comparison of Diamond and Nonparallel Fixation with Cannulated Screws for Femoral Neck Fracture of Pauwels:A Finite Element Analysis
In order to compare the biomechanical properties of four screws internal fixation for femoral neck fracture of Pauwels typeⅠ、Ⅱ、Ⅲ:diamond and nonparallel screws,the clinical CT images were used to establish models of three kinds of different Pauwels types and two kinds of configuration models through three-dimensional virtual software(Minics、Solideworks、Geomagic).Models were imported into software Ansys to assume material properties and load pressure.The maximum displacement,maximum stress and shear stress were observed.The biomechanical properties of diamond and nonparallel fixation with cannulated screws were differento Among Pauwels Ⅰ fracture(20°),the max displacement were 0.560 2 mm、0.561 0 mm,the max equivalent stresses were 23.68 MPa、24.49 MPa,the max shear stresses were 3.715 MPa、4.160 MPa.Among Pauwels Ⅱ fracture(40°),the max displacement were 0.562 0 mm、0.565 3 mm,the max equivalent stresses were 24.64 MPa、25.32 MPa,the max shear stresses were 4.540 MPa、5.549 MPa.Among Pauwels Ⅲ fracture(60°),the max displacement were 0.570 8 mm、0.572 3 mm,the max equivalent stresses were 25.91 MPa、26.08 MPa,the max shear stresses were 6.668 MPa、7.089 MPa.It is concluded the diamond configuration models has better stress dispersion effects,less displacement and shear stress conditions,better biomechanical stability under the same stress.
femoral neck fracturecannulated screwsfinite element analysisbiomechanics
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