What is Shoulder Instability?

Shoulder instability describes a range of conditions affecting the shoulder.  Instability means that the shoulder joint is too loose and is able to slide around too much in the socket.  In some cases the shoulder actually slips out of the socket and becomes dislocated. In a normal shoulder the ball portion of the joint moves approximately one inch forward or backward within the socket. Instability results when movement is too great and becomes painful.

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