Measuring glenoid version and the position of the humeral head on the glenoid.

Here is the method we use for characterizing glenoid retroversion and the position of the humeral head relative to the glenoid on the axillary view plain film.

See below: the glenoid version is represented as the angle between a line connecting the anterior and posterior edges of the glenoid (green line) on one hand and a line drawn down the center of the scapular body on the other (red line).

See figure below: the anteroposterior position of the humeral head on the glenoid is represented as the ratio of the length of the line segment drawn from the anterior lip of the glenoid to the center of the glenohumeral area of contact (red line) to the length of the line segment drawn between the front and back lips of the glenoid (green line).

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