Knowledge of the normal anatomy and physiology of the glenoid labrum is important for understanding the pathogenesis of labral tears.
Let's see how flexible the labrum is.
You might think that the labrum is rigid.
Early authors thought the labrum was uniformly rigid in shape.
The labrum is predominantly composed of moderately dense bundles of fibrous tissue and therefore is quite flexible.
The contour of the anterior inferior labrum can shift from round to triangular when the arm is moved from neutral to abduction-external rotation positioning during an MR arthrogram.
In the ABER position, AIGL pulls the anterior labrum, changing the shape of the flexible labrum to a triangle.
The shape of the labrum dynamically changes from flat in the external rotation of the arm to fold up in the internal rotation.
This plasticity is considered the most common reason that the tip of a normal labrum can be rounded in shape.
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