Based on the unilateral CT images of a clinical patient in stage III for avascular necrosis of femoral head, three-dimensional finite element models of proximal femur are established, including normal model, necrosis model and prothetic model. Based on the same set of CT images, the material properties are assigned to the three finite element models respectively. Finally, the process of bone grafting for avascular necrosis of femoral head is simulated with finite element analysis. The results indicate that when the necrosis parts of femoral head are removed, the stress and displacement of proximal femur increase accordingly, and after the surgical operation of bone grafting, the stress and displacement of proximal femur can decrease effectively and become closer to the normal state. All the results indicate that the bone grafting operation is effective and reliable.
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