Abstract
This study attempts to analyze the biomechanical effect of internal fixation (plated in parallel or plated vertically) on the basis of distal humeral fractures on musculoskeletal multibody dynamics using AnyBody in Finite Element Method. Humeral 3D models were reconstructed by MIMICS after volunteers' CT image input in *.dicom format, and processed by Geomagic Studio for surfaces, while locking plates and screws were then designed by Pro-E. A humeral model of T-type fracture was created and assembled in Hypermesh, to integrate fixtures (e.g., MPL/ PML/ ML), to grid the mesh and then assign materials. A musculoskeletal model of the upper limb was established by AnyBody to simulate elbow flexion and extension. They were finally imported to Abaqus for boundary conditions and dynamic analysis. In terms of Von Mises stress, its maximum increased and then decreased gradually during the joint motion, but P >0.05 in SPSS suggests no significant difference for all 3 fixtures. In terms o f displacement, when the elbow was at 90°, each motional pattern reached its peak as follows: ML180°=0.28mm, MPL90°=0.49mm & PML90°=0.54mm during flexion;ML180°=0.073mm, MPL90°=0.10mm & PML90°=0.12mm during extension. P < 0.05 suggests a significant difference for the displacements of all 3 fixations. P=0.007<0.01667 suggests the significant difference between the 2 fixations, e.g., PML90° and ML180°, indicating that the peak displacement of ML180° is less than that of PML90°. After generally analyzed in musculoskeletal dynamics, the biomechanical property of the fixtures was presented as: the displacement of the parallel plate was less than that of the vertical, and the parallel plate may optimize the clinical reduction anatomically.
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