Shoulders are my specialty (I am a specialized ortho PT)
Did y ou have surgery for your dislocated shoulder? How many times and how frequently does it dislocate?
Certain situations of repeatitive dislocation, rehab would only help little. Your inferior labrum and inferior glenohumeral ligaments (espciallyt he anterior, and sometimes also the posterior band) provideds the general stability of you GH (shoulder joint.) ONCE SOMETHIGN IS LOOSE inthe capsular and ligamentus level, there is NO GOING back. Dependending on your individual case, rehab may not help that much.
In general you need to do alot of scapular stabilization and external rotation strenthening and avoid Gh extension and internal rotation, unless you have posterior instead of anterior impingement syndrome, yo do not need to strengthen the external rotators.
Shoulders are VERy complex and facinating cases. If you give me more details, I can hlep you with more info.