Fig. 4.

Schematic representation of the humeral head articular surface in axial CT view. (A) Axial CT schematic representation of the humeral head articular arc. A Pre-traumatic configuration: blue line with arrows indicating the intact articular arc, blue dot marking the humeral head center. B Post-traumatic condition showing the remaining articular arc (blue line) and deficit arc caused by the reverse Hill–Sachs lesion (red line), with posterior glenoid rim engagement zone indicated (red arrow), and blue dot marking the humeral head center. Orientation: right shoulder