Fig. 2From: Augmented reality-based navigation system applied to tibial bone resection in total knee arthroplastyMarkers and smartphone used in the AR-KNEE system. From left to right: guide marker, pointer, oval marker, and smartphone. The camera of the smartphone recognizes two-dimensional bar codes of guide marker, pointer and oval marker when using the AR-KNEE system. Note that the oval marker has a slit that allows the surgeon to mark the tibial rotational alignment reference lineBack to article page