Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： The three-dimensional topological optimization of cervical interbody fusion cage was developedby the finite element method to enhance the fusion rate of the cervical interbody cage. 'The finite element( FE) model of C3-C7 segments was constructed and validated. The fusion FE model was developed by in-serting the cage into the C5-C6 disc space and intermal fixation used anterior plate-screw system.The ini-tial structures of cages made of polyether ether ketone ( PEEK) were set up into two types of elliptic cage and box. 'Topological optimization and weighted compliance optimization were developed under single andmultiple loading conditions. The structural configuration analysis of the cage was carried out after two timesof topological optimization. The results showed that the optimal structure of the cage is annular , and thematerials of the cage are concentrated in the back and both sides; the cage is optimized for multi-poreshape and single large-pore shape when the volume fraction is set to 50% and 30% , respectively , and theformer has more contact area with the endplate than the latter; the optimized cage increases the stress onthe intenal bone graft by reducing its own stress under loading. In this study ,the optimal PEEK cage wasdesigned by topological and weighted compliance optimization method , which was not affected by thechange of initial structures of cage. It can effectively reduce the stress shielding and increase the stressstimulation of internal bone graft , which will help to promote the cervical fusion.
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