Fig. 2.

In a standard glenosphere (left) the inferior aspect of the glenosphere is frequently flush with the lower border of the scapular neck. With an eccentric design (right) the glenosphere can be shifted inferiorly without changing the position of the metaglene base plate. Note: The position of the metaglene remains the same (solid blue line), but the centre of the glenosphere has been shifted inferiorly 2 mm (dashed blue line). The inferior overhang of the glenosphere provides a space between the glenosphere and the scapular neck (curved blue arrow), which may decrease notching