Establishment of Finite Element Model of External Fixation of Distal Radius Fracture Splint and Stress Analysis of Fracture Healing Process
Objective:To study the biomechanical properties of willow splint external fixation and fracture healing for distal radius fractures,and to provide theoretical basis for clinical treatment.Methods:The CT image file was transformed into a three-dimensional finite element model that can be used for calculation.The solid model of ulna,radius,muscle,and splint was reconstructed by using the three-dimensional reconstruction software Mimics10.01,and the model was meshed.The model was performed for smooth processing before was inputted into the finite element analysis software,and then output the solid model of ulna,radius,muscle and splint in STL format.Then the derived solid model was imported into the point cloud processing software Geomagicstudio 10.After denoising,smooth surface patches,grid and curved surface processing,a relatively smooth solid model was formed.The obtained solid models of ulna,radius,muscle,and splint were output in STP format and imported into the finite element software ANSYS12.0 to generate a computable finite element solid model.After introducing the solid model of ulna,radius,mus-cle,and splint into ANSYS12.0,the boolean operation of muscle,ulna and radius was carried out;the ulna and radius were subtracted from the muscle model;the muscle model was bonded with the model of ulna and radius,and then imported into the splint model to generate the solid model inclu-ding ulna,radius,muscle and splint.AO type A3 fracture of distal radius was established,and stress analysis was performed at different stages of fracture healing.Results:The solid model was divided into four contact units,namely radial splint and forearm,ulnar splint and forearm,dorsal splint and forearm,and volar splint and forearm,to complete the mod-eling of the splint-bound forearm model.Taking 0％healing(initial fracture),20％healing,and 50％healing as example,the areas with the greatest stress were located at the palm side,and the proximal end of the radial splint,and the wrist,and the maximum stress was 8.44 MPa and 0.92 MPa,respectively.Conclusion:The biomechanical characteristics of willow splint external fixation of distal radius fracture are that the pressure is easy to concentrate on the palmar side of rich soft tissue,the proximal end of radial splint and bony process.
splint external fixationfracture of distal radiusthree-dimensional finite element modelstress analysis
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