Fig. 1From: Augmented reality-based navigation system applied to tibial bone resection in total knee arthroplastyTotal knee arthroplasty using the AR-KNEE system. a The surgeon viewed the information superimposed on the surgical field through the screen of the smartphone in real time. Guide marker (resin marker with quadrate two-dimensional bar code) was fixed to the proximal tibia. The smartphone was placed in a sterilized case. b Screenshot image of (a). The tibial axis was superimposed on the patient’s lower leg (green line). When the smartphone camera recognized the two-dimensional bar code, the color of the marker guide turned light blue on the screenBack to article page