Shoulder instability often comes from a shoulder dislocation. If you dislocate your shoulder once, you have a very high probability of dislocating it again. These exercises should help keep it in place, by strengthening all the muscles around the shoulder joint. See Doctor Jo’s blog post about this at: http://www.askdoctorjo.com/content/shoulder-instability-exercises
The shoulder labrum tear can occur in different ways. When a patient’s shoulder is dislocated, the anterior (front) portion of the labrum is often torn. This is called a Bankart tear or lesion, and it is the most common form of ligament injury to the shoulder.