Labral-ligamentous complex of the shoulder. Evaluation with double oblique axial MR arthrography.
OBJECTIVE
To assess the ability of double oblique axial (DOA) MR arthrography in evaluating labral-ligamentous complex compared with conventional axial (CA) MR arthrography.


METHODS
MR arthrography of 51 shoulders, subsequently examined with arthroscopy, were retrospectively reviewed. DOA imaging was performed in all 51 shoulders and both DOA and CA imaging in 37 using a 1.5 T unit with gradient recalled-echo T2*-weighted sequences. DOA imaging was performed using perpendicular planes to the long axis of the glenoid fossa obtained by an oblique sagittal scout image. We compared the ability of DOA with that of CA MR arthrography to assess labral injuries and to demonstrate the whole length of the anterior band of the inferior glenohumeral ligament (AIGHL), which were shown to be intact by arthroscopy.


RESULTS
For anterior labral injuries, sensitivity and specificity were 87% and 93% with CA, and 94% and 100% with DOA imaging, respectively. For posterior labral injuries, sensitivity and specificity were 47% and 100% with CA, and 79% and 96% with DOA imaging, respectively. There were no statistically significant differences between CA and DOA images, except for the ability to diagnose posterior labral injuries, where DOA imaging had a significant superior sensitivity (p=0.0327). DOA images also demonstrated the whole length of the intact AIGHL in 10 of 11 shoulders, while CA imaging showed this in only 3 of 11.


CONCLUSIONS
DOA imaging was equal or better than CA imaging for evaluating the labral-ligamentous complex.
Sasaki
T
T
Department of Radiology, Hirosaki University School of Medicine, Hirosaki, Japan. sasatai@cc.hirosaki-u.ac.jp
Saito
Y
Y
Yodono
H
H
Prado
G L M
GL
Miura
H
H
Itabashi
Y
Y
Ishibashi
Y
Y
D000328:Adult; D005260:Female; D006801:Humans; D008023:Ligaments, Articular / Q000293:injuries*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D000070599:Shoulder Injuries