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.
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
- 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.
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