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This is a great article promoting evidence based medicine, as we have used sling and swath for thousands of years and it may be doing more harm than good.
http://www.mja.com.au/public/issues/179_07_061003/mur10335_fm.html
Treatment of shoulder dislocation: is a sling appropriate?
George A C Murrell
MJA 2003; 179 (7): 370-371
Introduction
— Competing interests
— References
— Author details
Abstract
Acute anterior shoulder dislocations, when managed non-operatively, have traditionally been treated by placing the arm in a sling. There is no formal evidence that this treatment is of benefit.
Three recently reported studies, one in cadavers and two in patients, suggest that the detachment of the structures in the front of the shoulder is made worse when the shoulder is placed in internal rotation, as when the arm is in a sling. By contrast, the structures are realigned when the arm is placed in external rotation.
Shoulder dislocations, if managed non-operatively, should not be treated by placing arms in a sling. Rather, placing them in a splint or using a pillow so that the the arm is externally rotated should be considered.
For thousands of years, perhaps even before Hippocrates, dislocated shoulders have been treated by using a sling with the arm internally rotated. Although, and perhaps because, this same treatment has been used for so long, there is little information on its efficacy. A number of studies of non-operative treatment for anterior shoulder instability have been unable to show that any given treatment is better than another, and all have been unable to reduce the rate of recurrence.1 Surgery has provided better outcomes in terms of preventing recurrence of shoulder dislocations,2 and even for symptoms of instability. A recent randomised clinical trial involving 40 patients and comparing sling immobilisation with arthroscopic surgery in first-time shoulder dislocation showed a recurrence rate in the surgical group of 16% at 2 years versus 47% in the sling group.3 Patients in the sling group whose shoulders had not redislocated also had worse functional scores than those in the surgical group. In particular, they were less able to participate, and performed at lower levels of sport and recreational activities than patients in the surgical group.