Type 4 acromion: a new classification.
The three types of acromial processes previously described in the literature include type 1, in which the undersurface is straight, and types 2 and 3, in which the undersurface is concave. In this report, a fourth type of acromion is described in which the undersurface is convex near its distal end. The frequency of a type 4 acromion in the normal population is discussed based on a retrospective review of the MR examinations of 30 patients that originally were read as normal.
Department of Radiology, University of Kentucky, Lexington, USA.
W J
WJ
Vanarthos
J U
JU
Monu
D000173:Acromioclavicular Joint / Q000293:injuries / Q000473:pathology; D000174:Acromion / Q000473:pathology*; D000293:Adolescent; D000328:Adult; D001265:Athletic Injuries / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012307:Risk Factors; D017006:Rotator Cuff / Q000473:pathology; D000070636:Rotator Cuff Injuries