Fig. 4

Landmarks and semilandmarks' digitization protocol. On the ribs, landmarks were placed at the most lateral point of the articular tubercle, the most inferior point at the angulus costae at the lower rib border (where the angle is most doubtlessly recognizable) and the most superior and inferior points of the sternal end. In addition, 13 equidistant semilandmarks were located along the lower costal border between the articular tubercle and the inferior sternal end