Reviewed by Dr. Jon Warner
(Humeral Avulsion of the Glenohumeral Ligaments Lesion)
The shoulder is the junction of three bones: the humerus (upper arm bone), the clavicle (collarbone), and scapula (shoulder blade). The ball-like head of the humerus fits into the cup-like end of the scapula (known as the "glenoid" or "shoulder socket"). This junction is commonly referred to as the shoulder socket, and is held together in part by ligaments, which connect bone to bone. When the humerus is forced out of the glenoid, whether by a fall on an outstretched arm, direct trauma to the area, or other injury, a dislocation occurs. A dislocation may cause the ligaments that join the humerus to the glenoid to tear away from their base on the humerus. This is known as a HAGL lesion, or Humeral Avulsion of the Glenohumeral Ligaments. It may be accompanied by a SLAP Lesion, Labral Tear, or a tear of the rotator cuff tendons.
Causes and Risk Factors