Pfj. Tirman et al., POSTEROSUPERIOR GLENOID IMPINGEMENT OF THE SHOULDER - FINDINGS AT MR-IMAGING AND MR ARTHROGRAPHY WITH ARTHROSCOPIC CORRELATION, Radiology, 193(2), 1994, pp. 431-436
PURPOSE: To determine the utility of magnetic resonance (MR) imaging a
nd MR arthrography in the evaluation of arthroscopic findings of poste
rosuperior glenoid impingement. MATERIALS AND METHODS: The findings at
MR imaging, MR arthrography, and physical examination with the patien
t under anesthesia were retrospectively reviewed in eight patients wit
h arthroscopic evidence of posterosuperior glenoid impingement. RESULT
S: All patients had shoulder pain; anterior instability was found in s
ix patients. Other than bone marrow abnormalities, findings at MR imag
ing were not reliable for the detection of posterosuperior glenoid imp
ingement. MR arthrography was superior to routine MR imaging in all fo
ur cases in which it was done; positioning the shoulder in abduction a
nd external rotation was beneficial in three of four patients. CONCLUS
ION: Impingement of the rotator cuff on the posterior superior glenoid
labrum is a cause of posterior shoulder pain in athletes who throw. M
R arthrography may allow detection of abnormalities associated with th
is clinical entity.