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Nursemaid Elbow:
It is typically taught that the way to reduce a nursemaid's elbow is to hold the elbow at 90 degrees, then firmly supinate and flex the elbow. Place your thumb over the radial head and apply pressure as you supinate.(Taken from Sean Fox's Pearl on 7/20/2007)
However, there is a growing body of evidence that is showing that hyperpronating the forearm actually has a higher success rate on first attempt, is easier to perform, and is associated with less pain then supinating the forearm. The overall reducation rates where similar for both methods.
The hyperpronation method consists of hyperpronating the forearm and then flexing the elbow. Since the child tends to already hold their arm in partial pronation, the hyperpronation technique tends to need less force and has been associated with less pain.
References
Bek D, Yildiz C, Kose O, Sehirlioglu A, Basbozkurt M. Pronation versus supination maneuvers for the reduction of 'pulled elbow': a randomized clinical trial. Eur J Emerg Med. Jun 2009;16(3):135-138.
Green DA, Linares MY, Garcia Pena BM, Greenberg B, Baker RL. Randomized comparison of pain perception during radial head subluxation reduction using supination-flexion or forced pronation. Pediatr Emerg Care 2006; 22:235–238.
Macias CG, Bothner J, Wiebe R. A comparison of supination/flexion to hyperpronation in the reduction of radial head subluxations. Pediatrics 1998; 102:e10.