Type I acromia presented with a flat inferior surface (17.2%), Type II acromia were characterized by a curved inferior surface (42.9%) and Type III acromia portrayed a hooked inferior surface (39.3%) (Bigliani et al., 1986; Rockwood et al., 2004).
(2006), individuals with Type I acromia (22%) had the lowest risk for rotator cuff impingement syndrome.
Morphology of the acromion and subacromial space: Three morphologic states of the acromia were observed, viz.