Glenoid labrum

The glenoid labrum is a fibrocartilaginous structure that attaches as a rim to the articular cartilage of the glenoid fossa and serves to deepen and increase the surface area. In this capacity, it acts as a static stabilizer of the glenohumeral joint, preventing dislocation and subluxation at the extremes of the range of motion.

Gross anatomy

The glenoid labrum is approximately 4 mm thick and is round or triangular in cross-section.


The capsule of the glenohumeral joint attaches to the glenoid labrum. The glenoid labrum is continuous with:

  • superiorly: tendon of the long head of biceps brachii
  • anteriorly:
    • anterior band of the inferior glenohumeral ligament
    • middle glenohumeral ligament (variably)

Blood supply and innervation

The outer glenoid is vascular and the inner glenoid is avascular . See glenohumeral joint for further details of named vessels and nerves.

Radiographic features

The glenoid labrum can be described in two ways :

  • clock face
    • 12 o'clock: superior
    • 3 o'clock: anterior
    • 6 o'clock: inferior
    • 9 o'clock: posterior
  • segments
    • superior
    • anterosuperior
    • anteroinferior
    • inferior
    • posteroinferior
    • posterosuperior

Variant anatomy

Related pathology

Siehe auch: