Possibility of diagnosing rotator cuff tears in areas with scarce medical resources: Can non-standard anteroposterior radiographs accurately predict rotator cuff tears?

All data, including AHI measurements taken in millimeters, were recorded to two decimal places to enhance precision. The magnification range for the image measurement was set between 500% and 2000% to further advance accuracy.  The schematic diagram of each measurement method. AHI: The minimum distance from the subcortical surface of the acromion to the humeral head .

CSA: The angle formed by line connecting the upper and lower rims of the glenoid, and the line extending from the lower glenoid to the acromion’s outside edge. AI: The ratio of two distances- the rim of the glenoid to the acromion (a), and from the rim of the glenoid to the outer edge of the humeral head (b) . UMI: The division of the distance from the geometric center of the humeral hea isd to the subcortical surface of the acromion by the radius of the humeral head .

DRR:The ratio between the outer circle radius R and the inner circle radius r, where the inner circle is the optimal fit for the humeral head, and the outer circle is a concentric circle intersecting Greater Tubercle of Humerus.