Figure 1. Measurement of the glenoid contact area or glenoid track. A: sagittal view showing the glenoid defect; B: axial view of the humeral head showing the Hill-Sachs interval, larger than the size of the Hill-Sachs lesion alone. In this case, it is a right shoulder with a Hill-Sachs interval greater than the calculation of the glenoid lesion. It is therefore an engaging or off-track injury.