Shoulder dislocations once reduced have typically been treated by placing the arm in a sling and swathe which holds the shoulder in adduction and internal rotation.
However, several studies have now shown that placing the arm in a splint with the shoulder adducted and in 10 degrees external rotation helps to prevent recurrent shoulder dislocation.
Patients should remain in the brace/split for 3 weeks.
External rotation is not recommended if there is an associated fracture.
Some commerical splints are now available to hold the shoulder in external rotation, however, you can make a small strut with plaster or fiberglass to achieve the same result.
References
McNeil NJ. Postreduction management of first-time traumatic anterior shoulder dislocations. Ann Emerg Med. Jun 2009;53(6):811-813.
