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  • Title: [Three-dimensional finite element analysis of biomechanical characteristics of cancellous screw in different bone densities].
    Author: Tian C, Zhang MC, Ouyang J.
    Journal: Nan Fang Yi Ke Da Xue Xue Bao; 2010 Nov; 30(11):2466-8. PubMed ID: 21097407.
    Abstract:
    OBJECTIVE: To predict the cancellous screw stress distributions and pull-out strength in cancellous bone with different densities using 3-D finite element analysis and provide biomechanical evidence for screw implant in clinical practices. METHODS: Three-dimensional models of bones with low, medium and high bone density and a fixation screw were generated in Solidworks. Finite element analysis was performed after importing these models to Abaqus to simulate the pull- out process. RESULTS: Stress concentrated both at the surfaces where major diameter of the screw connected the bone and at the proximal half angle of the 3 proximal screw threads. Maximum Von Mises stress of the threads decreased along the long axis of the screw. The pull-out strengths of the cancellous screw were 208.9 N, 431.45 N, and 648.80 N in low, medium and high bone density, respectively. CONCLUSION: During the pull-out process of cancellous screw, stress concentrates at the proximal end of the screw and the pull-out strengths are proportional to the cancellous bone density.
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