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a, b Insertion of the Kirschner guide wires with the help of the aiming block in the femoral shaft. c Optimal positioning of the osteotomy. d Fixation of the proximal fragment to the plate (to a 3.5 varus plate in this bone model). The two Kirschner wires in the ventral aspect of the femur in the proximal and distal fragments are inserted in case a derotation is planned together with the varus correction
