The Hallux Valgus Dimensional Finite Element Model Of The Establishment And Static Stress Analysis

Objective:Using the ways of Biomechanics to establish a three-dimensional finite elementmodel of hallux valgus foot,to analysis the static plantar stress in the same portion,thusprovide experiment evidence for the study of changes in the pathological andphysiological of the hallux valgus foot.Methods:1.In vivo hallux valgus footspecimens,Women,30,exclude other foot disorders.Use SIMENZ16Spiral CT to scanfrom her left foot heel to toe with the layer thickness l.0mm,interval1.0mm.Using mimicsto reconstruct the finite element model of her right foot bone;using Geomagic studio toremove the bad spot and mesh the bone.UG5.0software was used to establish a solidmodel of the right foot bone;ANSYS10.0software was used to assemble,mesh,give thematerial properties and finite element calculations.2.Use finite element model for thefollowing manipulation:(1)constraints various degrees of freedom of the talus;(2)move upthe ground and contact the planta pedis, stabilized the contact;(3)Simulate static bipedalstand conditions by loading.For a60kg person,load300N concentrated force from theground,150N Achilles tendon force vertically form Achilles tendon attachment points ofthe calcaneus. Process ANSYS command;get the foot mechanical analysisnephogram.3.Compare the results with studies from other group,and perform the Modelvalidation test.Results:1.The Eestablished three-dimensional finite element model haswell performance in geometry and reduction of the material properties,thus can satisfy theneed of finite element analysis;2.The plantar pressure distribution different significantlybetween hallux valgus foot and the normal foot,with the reduced pressure values underfirst metatarsal head,the increased trend of Pressure values under the third metatarsalhead,While the second,fourth,fifth metatarsal head pressure increased.Conclusion:1.UsingCT scan data,the created three-dimensional finite element model by Mimics\Geomagicstudio\UG\ANSYS software is practical and reliable and could perform different Mechanical Analysis according to the need.2.There are obvious differences between thehallux valgus foot and the normal foot in deformity of the foot structure andbiomechanical performance.The distribution law of metatarsal head pressure,getted fromthis study,could provide valuable biomechanical evaluation for the clinical treatment ofhallux valgus and make an objective evaluation of the efficacy of various hallux valgus.