Fig. 1.

Axial view—bone block healed in a medial position. The blue line indicates the line of reference between the anterior and posterior glenoid rim; the yellow lines are medial (4 mm) and lateral (2 mm) tolerance lines—the zone of “tolerance” is between these yellow lines; the red line indicates the most medial point of the lateral border of the graft; the green line shows the distance between the reference line and the lateral border of the graft