Figure 1. Measurement of coracoid tip position in the true anterior–posterior view of the shoulder. Glenoid cavity plane (line 1, tangent on the inferior and superior glenoid rim); glenoid cavity height (D1, distance between inferior and superior glenoid rim); parallel of line 1 at level of coracoid tip (line 2); inferior coracoid extension (D2, distance between superior glenoid rim and coracoid tip).