From the case:
Glenoid version measurement - Friedman method (diagram)
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Version angle (red) = 90o - angle between Firedman and glenoid lines
Fireman line (yellow) joins the midpoint of the glenoid line to the medial tip of scapular blade
glenoid line (blue) at the mid-glenoid level, joins the anterior and posterior margins of the glenoid rim
Case Discussion
Glenoid version:
range of normal is 0-7o (anteversion)
neutral version is 0o
retroversion is > 0o