Two joints in the body have what is called a labrum. The shoulder is one of these joints. The shoulder (glenohumeral joint) is a ball and socket joint. The shoulder blade bone (scapula) extends up to the top of the shoulder ending in what is known as the glenoid cavity, or the socket. At the top end of the upper arm bone, the humerus, is the humeral head which is shaped like a ball. The humeral head fits nicely into the glenoid cavity socket.

The glenoid cavity serves as the part of the shoulder that the humeral head fits into. In order to help the head of the humerus fit into the socket even better, the glenoid cavity has a labrum around its edges in order to make this socket deeper. The labrum is a soft ring of tissue that goes around the edge of the socket, in effect deepening the socket. The head of the humerus moves more easily with protection from the labrum. Like the rest of connective tissues in our bodies, the labrum is vulnerable to tears and injury. For the shoulder, tears of the labrum can lead to chronic aches and pain and impaired function. With a labrum tear of the shoulder, you may hear the terms glenoid labrum tear or just labral tear. There are multiple types of a labral tear in the shoulder. These are:

● SLAP tear: This stands for Superior Labrum Anterior to Posterior. This type of tear is at the top, front of the labrum and torn from front to back. There will usually be biceps brachii involvement with this type of tear.
● Bankart Lesion: Usually a tear of the labrum as a result of dislocation of the shoulder
● Posterior instability: back portion of the labrum is torn
● Anterior instability: front portion of the labrum is torn