Fig. 5

Illustration of the marked difference in postoperative axis deviation between subtrochanteric and supracondylar osteotomies. In green subtrochanteric osteotomy with mal-angulation of 30° in sagittal plane and rotation of 30° resulting in a postoperative mechanical leg axis of 8.6° valgus (preoperative axis 5.1° valgus). In blue supracondylar osteotomy with mal-angulation of 30° in sagittal plane and rotation of 30° resulting in a postoperative mechanical leg axis of 18.2° valgus (preoperative axis 5.1° valgus). In orange visualized the preoperative situation. For visualization purposes the mechanical leg axis has been marked schematically in black