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Infraglenoid Tubercle

tuberculum infraglenoidale

The infraglenoid tubercle is a rough bony eminence at the inferior rim of the glenoid cavity, providing the origin of the long head of the triceps brachii. It is the posteroinferior attachment point of the glenohumeral joint capsule and the inferior labrum. The long head of triceps descends through the quadrilateral space with the axillary nerve and posterior circumflex humeral artery.

Region: Shoulder

Clinical Relevance

Clinical Notes

Avulsion of the long head triceps from the infraglenoid tubercle is rare but can occur in heavy overhead loading or shoulder instability events. It produces weakness of elbow extension, particularly in the overhead position. The infraglenoid tubercle is also the inferior anchor point for Bankart lesion repair: in anterior shoulder instability, the inferior labrum and capsule detachment extends inferiorly from the anteroinferior glenoid rim toward the infraglenoid region, and capsulolabral repair must address the inferior extent.

Pathology

Common Injuries & Conditions

Long Head Triceps Avulsion from Infraglenoid Tubercle

Forcible elbow flexion against a contracting triceps or heavy overhead loading avulses the long head triceps from the infraglenoid tubercle, producing posterior shoulder pain, a palpable gap, and elbow extension weakness that worsens in the elevated arm position, repaired by bone anchor reattachment.