<正> 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 dur