Fig. 3

We enlarged the femoral bone marrow cavity to reach the maximum contact with the femoral cortex, inserted the test model, pulled the lower limb to try to restore, ensuring that there is no tension in the sciatic nerve, measured the length of the femur that needs to be shortened when it can be restored, and cut off the proximal femur according to this length. We put the femoral prosthesis in the “press-fit” mode and paid attention to ensure the correct anteversion