MRI of internal impingement of the shoulder.
OBJECTIVE
Internal impingement is a condition that occurs in athletes in which the shoulder is put in extreme abduction and external rotation during overhead movements. During this motion, the posterior fibers of the supraspinatus tendon, anterior fibers of the infraspinatus tendon, or both can get impinged between the humeral head and the posterior glenoid. The purpose of this study was to evaluate the ability of MRI to show the findings of internal impingement of the shoulder.


CONCLUSIONS
As opposed to our six patients with clinically and surgically diagnosed internal impingement, the control patients had isolated pathology in the rotator cuff, labrum, or humeral head. We found that the constellation of findings of undersurface tears of the supraspinatus or infraspinatus tendon and cystic changes in the posterior aspect of the humeral head associated with posterosuperior labral pathology is a consistent finding diagnostic of internal impingement.
Giaroli
Eddie L
EL
Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710, USA.
Major
Nancy M
NM
Higgins
Laurence D
LD
D000293:Adolescent; D000328:Adult; D001182:Arthroscopy; D001265:Athletic Injuries / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D011446:Prospective Studies; D012189:Retrospective Studies; D019534:Shoulder Impingement Syndrome / Q000473:pathology*