Clinical significance of three dimensional finite element analysis on humerus fracture

Abstract Objective:To treat humerus fracture with three dimensional pattern andfinite element analysis,providing mechanical basis for treating humerus fracture.Methods:Humerus pattern was established based on the CT images,and calculation was done by ANSYS5.6 software.Three dimensional ten-node tetrahe-dron unit was selected and were divided into 2729 nodes,49041 units.Distribution and amount of axial com-pression of humerus were analyzed when clip angle was 30°,45°,90°between facture face and axial line with fixed X,Y,Z directions.Results:The distribution of stress was greatly different between fracture face and non fracture face.Stress in fracture part was fairly concentrated with incomplete symmetric distribution around the center of fracture face;Greater stress distributed in the regions 10 mm from fracture face, which was 2-3 times that of other stress regions.Conclusion:Required load must be estimated under various condi-tions as to select the suitable internal fixation implants during the treatment of humerus fracture,which can provide helpful stress environment for fracture healing.

Objective: To treat humerus fracture with three dimensional pattern and finite element analysis, providing mechanical basis for treating humerus fracture. Methods: Humerus pattern was established based on the CT images, and calculation was done by ANSYS5. 6 software. Three dimensional ten-node tetrahedron unit was selected and were divided into 2 729 nodes, 49 041 units. Distribution and amount of axial compression of humerus were analyzed when clip angle was 30°, 45°, 90° between fracture face and axial line with fixed X, Y, Z directions. Results: The distribution of stress was greatly different between fracture face and non fracture face. Stress in fracture part was fairly concentrated with incomplete symmetric distribution around the center of fracture face; Greater stress distributed in the regions 10 mm from fracture face, which was 2-3 times that of other stress regions. Conclusion: Required load must be estimated under various conditions as to select the suitable internal fixation implants during the treatment of humerus fracture, which can provide helpful stress environment for fracture healing.