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Natl J Med Res. 2013; 3(2): 137-139

Variations of Origin of Long Head of Biceps Brachii Muscle from Glenoid Labrum of Scapula

Ketan Chauhan, Meenakshi Bansal, Pratik Mistry, Dhananjay Patil, Sanjay Modi, Chandrakant Mehta.

Introduction: The origin of the long head of the biceps brachii tendon in the majority of literature is not same. The relationships of the tendon with the glenoid labrum of the scapula also vary.
Methodology: Dissection of 50 shoulder joints of adult human cadavers of both sexes done. The joint cavity was exposed by making an incision in the posterior part of the capsule of the joint to see the extent of its attachment on gleniod labrum.
Results: In all specimens, the biceps tendon was found to be attached to the supraglenoid tubercle as well as to the gleniod labrum. In 74% of specimens, the major part of the tendon was attached to the posterior aspect of the labrum while in 26% it was seen in the anterior aspect as well. The posterior labral attachment extended up to the lower part whereas the anterior attachment was limited to the upper part only. On the basis of the biceps attachment to the anterior or posterior labrum, we categorized them into three types of origin. Conclusion: The awareness of these normal anatomical variations are significant for arthroscopic diagnosis and may help to explain the various patterns of injury seen in partial or complete detachment of the tendon, the labrum or both.

Key words: glenoid labrum, biceps brachii, anterior labrum, posterior labrum.

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