[Labrum_01] Shoulder MRI, normal anatomy, variant, high origin of anterior band,

Normal Labrum and Normal Labral Variants 

Morphologic Appearance 

The long head of the biceps tendon attaches both to the superior glenoid and to the superior labrum [13], with approximately 50% of the biceps tendon fibers arising from the superior glenoid labrum and the remainder from the supraglenoid tubercle 

 

AJR 2011; 197:596–603

Labrum is predominantly composed of moderately dense bundles of fibrous tissue and therefore is quite flexible.This plasticity is considered the most common reason that the tip of a normal labrum can be rounded in shape 

 

Semin Musculoskelet Radiol 2014;18:365–373.

The cross-sectional shape of the labrum is triangular in most cases (anterior, 64%; poserior, 47%), followed by rounded (anterior, 17%; posterior, 33%) (14,16). However, in a minority of cases the normal labral shape can be blunted, cleaved, notched, or even flat 

The anterior and inferior portions of the labriun are smaller than their posterior and superior counterparts, respectively

 

Curr Radiol Rep (2017) 5:41

Flexible redundant folds at both the anterior and posterior capsular attachments can result in a notched or kinked appearance of the labrum.This notched appearance can also result from the close apposition of the middle and inferior glenohumeral ligaments with the anterior labrum on MR images 

 

Magn Reson Imaging Clin N Am 20 (2012) 213–228

 

Semin Musculoskelet Radiol 2014;18:365–373.

 

Curr Radiol Rep (2017) 5:41

 

Skeletal Radiol (2012) 41:525–530

In the presence ofa high attachment anterior band, the anterosuperior labrum is either attenuated (hypoplastic) or absent. 

 

Stoller’s Orthopaedics and Sports Medicine: The Shoulder

 

Stoller’s Orthopaedics and Sports Medicine: The Shoulder

Normal anteriorinfolding of the anterior band of the IGHL

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1. Referenas 

1. Stoller’s Orthopaedics and Sports Medicine: The Shoulder 

1. Imaging the Glenoid Labrum and Labral Tears1 

Tineke De Coninck, MD Steven S. Ngai, MD
RadioGraphics 2016; 36:1628–1647

1. Anatomic Variants and Pitfalls of the Labrum, Glenoid Cartilage, and Glenohumeral Ligaments 

Kevin S. Dunham, MDa, Jenny T. Bencardino, MDb
Magn Reson Imaging Clin N Am 20 (2012) 213–228

1. Shoulder MR Imaging Normal Variants and Imaging Artifacts 

Darren Fitzpatrick, MDa, Daniel M. Walz, MDb,*
Magn Reson Imaging Clin N Am 18 (2010) 615–632

1. Imaging Update on the Glenoid Labrum: Variants versus Tears 

Cristy N. Gustas, MD1,2 Michael J. Tuite, MD, FACR2
Semin Musculoskelet Radiol 2014;18:365–373.

1. Superior Labral Anteroposterior Lesions of the Shoulder: Part 1, Anatomy and Anatomic Variants 

Shahla Modarresi1 Daria Motamedi2
AJR 2011; 197:596–603

1. MR Arthrography in the Differential Diagnosis of T ype II Superior Labral Anteroposterior Lesion and Sublabral Recess 

Wook Jin1 Kyung Nam Ryu2
AJR 2006; 187:887–893

1. Anatomical Variants and Pitfalls in Magnetic Resonance Imaging of the Shoulder that can Simulate Pathology 

Andre ´ Yui Aihara1•Paola Cecy Kuenzer Goes2
Curr Radiol Rep (2017) 5:41

1. High origin of the anterior band of the inferior glenohumeral ligament: MR arthrography with anatomic and histologic correlation in cadavers 

Francisco Alejandro Ramirez Ruiz
Skeletal Radiol (2012) 41:525–530

1. SLAP lesions: Anatomy, clinical presentation, MR imaging diagnosis and characterization 

Debra Changa,b,c,∗, Aurea Mohana-Borgesa
European Journal of Radiology 68 (2008) 72–87

1. Superior Labral Anteroposterior Tears:   Accuracy and Interobserver Reliability of Multidetector CT Arthrography for Diagnosis  1 

Yeo Ju   Kim , MD    Jung-Ah Choi ,  MD
Radiology 2011; 260:207–215

1. Imaging of Shoulder Instability 

Daniel M. Walz, MD1 Alissa J. Burge, MD2
Semin Musculoskelet Radiol 2015;19:254–268.

1. Posteroinferior Labral Cleft at Direct CT Arthrography of the Shoulder by Using Multidetector CT: Is This a Normal Variant?1 

Guen Young Lee, MD Jung-Ah Choi, MD
Radiology. 2009 Dec;253(3):765-70