Fig. 2
From: A radiological study on the relationship between the novel acromial angle and rotator cuff tears

Measurement of the new acromial angle. A: Anterior edge of the base of the acromion; B: Posterior edge of the base of the acromion; C: One-third point along the AB line from the front; D: A point at the base of the acromion, connected to C and perpendicular to AB.