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. 2019 Nov 11;6:44. doi: 10.1186/s40634-019-0212-6

Fig. 2.

Fig. 2

Markers 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 line