Prognostic models for identifying risk of poor outcome in people with acute ankle sprains: the SPRAINED development and external validation study.

Background: Ankle sprains are very common injuries. Although recovery can occur within weeks, around one-third of patients have longer-term problems.

Objectives: To develop and externally validate a prognostic model for identifying people at increased risk of poor outcome after an acute ankle sprain.

Development and prospective external validation of a tool to predict poor recovery at 9 months after acute ankle sprain in UK emergency departments: the SPRAINED prognostic model.

Objectives: To develop and externally validate a prognostic model for poor recovery after ankle sprain.

Setting And Participants: Model development used secondary data analysis of 584 participants from a UK multicentre randomised clinical trial. External validation used data from 682 participants recruited in 10 UK emergency departments for a prospective observational cohort.