Smartphone App to Improve Functional Outcomes in Ankle Sprains

Inclusion Criteria: (i) Age 12-21 years (ii) Presenting to the Emergency Department of the Children's Hospital, London Health Sciences Centre, London, Ontario, with a unilateral acute (\<48 hours) ankle inversion injury. (iii) Use a WiFi enabled smartphone with either an iOS or Android operating system with enough memory capability to host the App. The diagnosis of an ankle inversion injury will be made on a clinical basis by the treating emergency physician after a fracture has been ruled out radiographically. We will include all grades of ankle injuries, including suspected Salter-Harris I of the distal tibia or fibula. Exclusion Criteria: * Children unable to read or understand English above at least a grade 8 literacy level * Children who are not independently ambulatory (without the use of an assistive device) * Children with a developmental disability precluding the full comprehension of study-related procedures, * Children with multi-system or multi-limb injuries * Children with a concomitant lower extremity fracture or dislocation (with the exception of a suspected Salter-Harris type I injury).