SO, HOW IS THE SHOULDER STABILIZED?

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The shoulder is stabilized both passively and actively.  The labrum (Latin for ‘lip’) is a fibrous ring that deepens the socket and also provides attachment for the shoulder capsular ligaments as a means of passive stabilization.  There are 18 muscles around the shoulder joint that provide power and compressive forces that pull the humeral head (the golf ball) into the glenoid (the tee).  The amazing thing is that the shoulder is stable through an arc of 180 degrees or more in most planes.

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