Principles of Valgus Intertrochanteric Osteotomy (VITO) after Femoral Neck Nonunion

Figure 2

Preoperative planning for valgus intertrochanteric osteotomy (VITO). A line representing the compressive force is drawn 25 degrees from the anatomical axis of the femur (upper left). A line perpendicular to the compressive force (X) is then drawn for reference (upper right). Line (Y) represents fracture line obliquity (lower left). The angle formed between (X) and (Y) will reflect the angle of the resected wedge (lower right).