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Radiology, Vol 208, 375-380, Copyright © 1998 by Radiological Society of North America

ARTICLES

Glenohumeral joint: comparison of shoulder positions at MR arthrography

SM Kwak, RR Brown, D Trudell and D Resnick
Department of Radiology, Veterans Administration Medical Center, San Diego, USA.

PURPOSE: To compare neutral, external rotation, and abduction external rotation positions of the glenohumeral joint during magnetic resonance (MR) arthrography in the assessment of the joint capsule, biceps-labral complex, and glenohumeral ligaments. MATERIALS AND METHODS: MR imaging with intraarticular administration of gadopentetate dimeglumine was performed in 10 adult cadaveric glenohumeral joints. Fat-suppressed oblique coronal, oblique sagittal, and axial. T1-weighted spin-echo imaging and axial three-dimensional spoiled gradient-recalled imaging were performed with each shoulder in the neutral, external rotation, and abduction external rotation positions. Shoulders were sectioned in the planes that yielded optimal MR images. Anatomic and MR imaging findings were correlated. RESULTS: The biceps-labral complex was best visualized on oblique coronal and axial images obtained in external rotation. Oblique axial abduction external rotation imaging best delineated the inferior glenohumeral ligament but did not improve assessment of the superior and middle glenohumeral ligaments in comparison with findings in neutral and external rotation. CONCLUSION: Although MR arthrography of the glenohumeral joint clearly delineates the biceps-labral complex and glenohumeral ligaments, external rotation of the shoulder optimizes visualization of the former structures. Abduction external rotation is the best position for evaluation of the inferior glenohumeral ligament and anterior capsular attachment.


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