Fig. 1

T-scale measurements. Using merged slices of the anterolateral edge of the acromion and the lateral edge of the coracoid process, a line was drawn between the two portions, and then the perpendicular distance from the center of the humeral head to the line was measured. When the center point was located outside the line, the T-scale was represented as a negative value. The measured T-scale was (a) 2.2 mm and (b) -6.4 mm