Methods of reduction. Once NME is diagnosed, there are 2 methods of reduction: hyper-pronation and supination-flexion. Reduction is best performed with the child sitting in the parent’s lap with the injured arm facing the examiner.
Success rates for both methods of NME reduction are statistically similar; however, first-attempt success rates are significantly higher with the hyper-pronation method than with supination-flexion.9 Furthermore, physicians have deemed the hyper-pronation method significantly easier to perform than supination-flexion.9 A Cochrane review by Krul et al10 concluded that the hyper-pronation method may result in lower failure rates than supination-flexion, but due to limited evidence, the researchers were unable to draw any conclusions on other outcomes, such as pain. Green et al11 noted that hyper-pronation is perceived by parents of children with NME as being less painful. For these reasons, hyper-pronation should be utilized as the first method of reduction, followed by supination-flexion if the former does not work.12
Additional management. In a limited study of 50 children with pulled-elbow injuries, ultrasound revealed that 78% had an intact yet interposed radial annular ligament and 22% had a tear in the radial annular ligament.13 The authors propose that if, after appropriate reduction methods are attempted, no pop is felt, or there is no prompt clinical improvement, and ultrasound is not available to assess the integrity of the annular ligament, the child should be placed in a splint for 7 days and referred for orthopedic intervention.13
Our patient returned to the PED 3 days later, complaining of pain and an inability to move her left arm after her older sibling pulled her by her outstretched arms. She was once again diagnosed with NME, the injury was reduced, and she was using the arm within minutes. She has not presented to either the PED or the pediatric clinic with a similar complaint since. Discarding outliers, NME recurrence rates fall within a range of 23.7% to 32.9%.14,15
THE TAKEAWAY
Pre-reduction x-rays are not warranted in cases of NME unless there is suspicion for fracture or another injury. The 2 reduction methods, hyper-pronation and supination-flexion, are easily mastered. Any reduction should be quick, easy, and as painless as possible. Hyper-pronation should be utilized first, as this maneuver seems to be the more successful and is perceived by parents as being less painful. However, it is always most helpful to be proficient in both methods. If, after appropriate attempts at reduction, the child has not regained the use of the arm, 7 days of splinting is recommended, along with an orthopedic referral.
CORRESPONDENCE
Robert N. Anderson, DNP, APRN, (F)NP-C, ENP-BC, Vanderbilt Health, 512 Autumn Springs Court, Suite 100 C, Franklin, TN 37067; bob.anderson@vumc.org