A CT scan dataset of the lower limb of a patient with extorsion deformity was obtained for three-dimensional reconstruction using Mimics software and preparing a solid model.  The tibia model was imported to the FEA pre-processing software for meshing procedure and then exported to Mimics.  All the segments of the tibia meshed model were assigned uneven material properties based on the relationship between CT gray values and material properties in the Mimics software. 
Mimics
In the CAD software, the parameters for osteotomy simulation were defined including the navigation axis, rotation angle and reference plane. 
CAD software
The tibia model was imported to the FEA pre-processing software for meshing procedure and then exported to Mimics. 
FEA pre-processing software