ACTRN12611000101987.

Methods	Randomised controlled trial: randomisation generated by computer and participants allocated to treatment group by numbered sealed opaque envelopes
Participants	100 participants (target), aged 3 to 14 years (eligible) with distal third radius fractures Inclusion criteria: distal third radius fractures with or without associated ulna fractures; closed reduction of the fracture required; treated at Starship Childrens Hospital; informed consent is obtained Exclusion criteria: open fractures; fractures manipulated outside of Starship Childrens Hospital; non‐displaced fractures or those fractures not requiring reduction; any irreducible fracture requiring open reduction and/or internal fixation or percutaneous wiring
Interventions	1. Sugar tong plaster of Paris splint with an elastic bandage. Splint changed to an above‐elbow cast at 2 weeks if no loss of reduction. Cast duration: 3 to 4 weeks 2. Above‐elbow circumferential plaster of paris cast. Cast duration: 5 to 6 weeks
Outcomes	Follow‐up: 1, 2 and 6 weeks Primary: remanipulation rates, determined by X‐rays Secondary: cast complications, determined by questionnaire at 6‐week visit
Notes	Full text not available. Included based on trial registration ACTRN12611000101987, Date of registration: 31 January 2011 JE sent email to K Huh 2 March 2017 asking for information. A follow‐up email was sent on 22 March 2017 JE sent email to Starship Hospital (sponsor) 30 March 2017 asking for information. No response received.