Fig. 3A–C.

Important navigation procedures are shown. (A) After registration of bony landmarks and hip, knee, and ankle centers, the proximal tibial resection was performed. Varus-valgus angle of the resected tibia was checked (asterisk). (B) In the femoral planning step, to achieve a rectangular mediolateral gap in knee extension and flexion, varus-valgus angle and rotation (dagger) of the femoral component are adjusted with navigation dictation. The numbers displayed next to femurs and tibias represent expected amounts of bone resection. (C) After distal femoral resection, the rotational position of the AP femoral cutting jig on the distal femur (double dagger), which is positioned manually, is displayed in real time. This represents actual femoral component rotation. In this case, the femoral component is in 2º external rotation relative to the posterior condylar axis. Green = this value is as planned; Ext. = extension.