Fig. 5.

Operation using the arKA technique assisted by the navigation system. (A) Tibial resection was performed at 4° varus to the vertical line of the mechanical axis of the tibia and 2° posterior slope. (B) A moderate varus deformity was preserved on the femoral side with a biomimetic wider lateral flexion gap. (C) Record after resection of tibia and femur. (D) Final coronal alignment after cementation of the definitive prosthesis. (E) Illustration of arKA in a severe varus knee. Tibial and femoral resection (red) was more varus using arKA than MA (orange). Abbreviations: mFA mechanical femoral axis; mTA mechanical tibial axis; FR femoral resection; TR tibial resection