BACKGROUND: Minimally angulated fractures of the distal radius are common in children and have excellent outcomes. We conducted a randomized controlled trial to determine whether the use of a prefabricated splint is as effective as a cast in the recovery of physical function. METHODS: We included 96 children 5 to 12 years of age who were treated for a minimally angulated (<= 15 degrees) greenstick or transverse fracture of the wrist between April 2007 and September 2009 at a tertiary care pediatric hospital. Participants were randomly assigned to receive either a prefabricated wrist splint or a short arm cast for four weeks. The primary outcome was physical function at six weeks, measured using the performance version of the Activities Scale for Kids. Additional outcomes included the degree of angulation, range of motion, grip strength and complications. RESULTS: Of the 96 children, 46 received a splint and 50 a cast. The mean Activities Scale for Kids score at six weeks was 92.8 in the splint group and 91.4 in the cast group (difference 1.44, 95% confidence interval (CI) -1.75 to 4.62). Thus, the null hypothesis that the splint is less effective by at least seven points was rejected. The between-group difference in angulation at four weeks was not statistically significant (9.85 degrees in the splint group and 8.20 degrees in the cast group; mean difference 1.65 degrees, 95% CI -1.82 degrees to 5.11 degrees), nor was the between-group differences in range of motion, grip strength and complications. INTERPRETATION: In children with minimally angulated fractures of the distal radius, use of a splint was as effective as a cast with respect to the recovery of physical function. In addition, the devices were comparable in terms of the maintenance of fracture stability and the occurrence of complications. (ClinicalTrials.gov trial register number NCT00610220).

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