Fig. 4

The method for calibrating the coordinate system of the measurement system is shown in the figure, which indicates the adjustment directions of the cameras and displays the coordinate systems after alignment in two different scenarios. A shows the three coordinate systems used in the experiment: a represents the frontal microscope camera coordinate system, b represents the lateral microscope camera coordinate system, and c represents the guide coordinate system. Red coordinate axes in the figure indicate that they have been aligned parallel to the guide coordinate system, while black coordinate axes indicate that they have not been aligned to parallel. A shows the coordinate system alignment process when the K-wire tip is not obstructed, while B shows the alignment process when the K-wire tip is obstructed