Labral-ligamentous complex of the shoulder: evaluation with MR arthrography

Area of Science:

• Radiology
• Orthopedic Surgery
• Sports Medicine

Background:

• The labral-ligamentous complex is crucial for shoulder stability.
• Accurate assessment of labral pathology is essential for diagnosing shoulder instability.
• The inferior glenohumeral ligament (IGHL) plays a key role in shoulder stability.

Purpose of the Study:

• To evaluate the diagnostic utility of magnetic resonance (MR) arthrography for the labral-ligamentous complex.
• To test the hypothesis that the IGHL is a significant anatomical factor in clinical shoulder instability.

Main Methods:

• Prospective study of 48 shoulders with surgically confirmed labral diagnoses.
• All shoulders underwent MR arthrography following intra-articular gadopentetate dimeglumine injection.
• Comparison of MR arthrographic findings with surgical outcomes.

Main Results:

• MR arthrography demonstrated high diagnostic accuracy with 91% sensitivity and 93% specificity for labral abnormalities.
• Most labral lesions (30/32) were located at the labral-bicipital junction, glenohumeral ligament origins, or both.
• Labral abnormalities involving the IGHL origin were present in 22 of 23 clinically unstable shoulders.

Conclusions:

• MR arthrography effectively visualizes the relationship between labral tears and glenohumeral ligament origins.
• The technique aids in differentiating between stable and unstable labral lesions.
• MR arthrography is a valuable tool for assessing shoulder instability related to the labral-ligamentous complex.