- Otherwise healthy children aged 5 to 17 years who present to the study ED within three days of a wrist injury that is diagnosed in the ED as a distal radius buckle fracture will be eligible for enrolment. Furthermore, approximately 15% of children with this fracture have an associated ulnar buckle or ulnar styloid fracture. In previous similar research, children with these associated ulnar fractures were included in the study population. Thus, distal radius buckle fractures with or without an associated buckle/styloid fracture of the distal ulna will be eligible for participation.