Question: what is type 1 acromion?
Answer: 3 What are the three morphologic types of the acromion? Bigliani classified the acromion according to its shape. Type I acromion is flat (17% incidence); type II (43% incidence) curves downward into the rotator cuff outlet; and type III (40% incidence) is hooked downward into the rotator cuff outlet.