Johnny Silva Cancer Research

Variants of the origin of the long head of the biceps from the scapula and glenoid labrum according to Vangsness et al [131

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One hundred fresh-frozen shoulders were studied. Each specimen was dissected to expose the intact shoulder capsule. The authors then photographed the tendon attachment to the supraglenoid tubercle, recording the percentage of fibres arising from the tubercle, the anterior labrum, and the posterior labrum.

Four types of attachment could be distinguished:

■ Type I: All of the labral part of the attachment was to the posterior labrum, with none to the anterior labrum (Fig. 16 a)

■ Type II: Most was to the posterior labrum, but with a small contri bution to the anterior labrum (Fig. 16b)

■ Type III: Equal contributions to anterior and posterior labrum (Fig. 16 c)

■ Type IV: Most attached to the anterior labrum, with a small contri bution to the posterior labrum (Fig. 16 d)

Fig. 16a-d. a Type I. The labral attachment is entirely posterior, with no contribution to the anterior labrum. b Type II. Most of the labral contribution is posterior

Fig. 16. c Type III. There are equal contributions to both the anterior and the posterior parts of the labrum. d Type IV. Most of the labral contribution is anterior, with a small contribution to the posterior labrum