Fig. 3

a-e This is an image of a curved intertrochanteric varus osteotomy (CVO) case. f-j This is an image of a control case. a, f Femoral implantation in a coronal view. b, g Density mapping shows the type of bone in contact with the implant by color. Yellow areas indicate contact with cortical bone, red with dense trabecular bone, and green with sparse trabecular bone. The numbers indicate the zone number of Gruen's zone classification. c, h Femoral implantation at the Gruen's zone 1, 7 in an axial view. The blue color indicates the stem in the intramedullary area. The red color indicates the stem in extramedullary area, in which cortical bone. The green color indicates the intramedullary area without the stem. The CVO case has many extramedullary areas. d, h Femoral implantation at the Gruen's zone 2, 6 in an axial view. e, j Femoral implantation at the Gruen's zone 3, 5 in an axial view