Figure 1
Diagram representing the full process from CBCT scans to bone angular measurements. A typical patient in single-leg weight-bearing during the CBCT scan (A). The 3D data-set including volume rendering of the foot is available at the interactive screen (B). This Dicom file is used both with the MIS (C1) and DIS (C2) software, respectively for the semi-automatic and automatic bone segmentation process: all foot and ankle bone segments eventually were modelled separately, and the ground segment is also identified. The same bone models, but in the foot anatomical reference frame (FootAF), here in a lateral view (D). Construction of the three anatomical axes by means of the PCA technique (E): an exemplary application to the calcaneus model with the three axes depicted (above), and the same for all foot bone models (below). Exemplary diagrams for the calculated angular measurements (F): in the lateral projection, the angle between the talus and calcaneus (RL_TACA, above) and between the talus and the 1st metatarsus (RL_TAM1, below), i.e. the Meary’s angle.
