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Fig. 5. —Diagram shows method for quantifying humeral position relative to glenoid fossa. Short line segment (G) connects anterior and posterior tips of osseous glenoid and represents length of glenoid fossa. Second longer line segment (SS) is drawn tangentially to ventral or costal surface of scapular body and bisects glenoid line segment G. Distance between this line, extended through humeral head, and center of humeral head (x) represents humeral translation distance. If center of humeral head is posterior to line segment SS, distance (in millimeters) is recorded as negative value and if anterior, as positive value.