On 09-12-2009 at 1:51PM I was advised by Franklin County Dispatch of a subject that had received a dislocated shoulder in a tubing accident and was being taken by Private Boat to the Sagamore Resort Dock, and Union County had an EMS unit en route.  I arrived at the Sagamore Dock's at the same time as Union County Medic #3, and located the victim setting on the stern of the motorboat listed holding his left shoulder and complaining of severe pain to his shoulder.  Two of the individuals that were boating with the victim were physicians, and advised they tried to get the victims shoulder back in the socket but had been unsuccessful.  The victim and witness' in the boat stated the victim was being pulled on an Obrien ski tube and pointed and described the area of Reservoir of just South of the Franklin/Union county line near the center of the Reservoir.  All the parties (victim included) stated they were traveling about 20 MPH pulling the ski tube, when the tube crossed a small set of waves created by other recreational boaters, the tube went airborne tossing the victim into the water.  Upon impact with the water the victim's left shoulder was dislocated.  The victim stated his shoulder has been dislocated prior to this incident and indication was made it has happened more than once.  The victim's parent or guardian was not present as he was with friends on a church outing.  His mother was contacted via cellular phone by Medic #3, and permission was granted for treatment and transport to Fayette Memorial Hospital in Connersville, IN.   There was no indication of alcohol or drug use or evidence present and no laws violated in this injury accident.