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A validation study for a clinical decision rule for acute wrist injury
Anne Brants1, Berwout van der Woude2, Michiel IJsseldijk3
1Emergency Department, Canisius-Wilhelmina Ziekenhuis, Weg door Jonkerbos 100, 6532 SZ, Nijmegen, The Netherlands. a.brants@cwz.nl.
Purpose:
Acute wrist injury is a common reason for visiting the emergency department. To date, there are no implemented clinical decision rules to predict a fracture in this group of patients. We previously identified six clinical predictors in adult patients with acute wrist trauma. The aim of this study was to validate these predictors as a decision rule in a validation cohort.
Methods:
This prospective cohort study was conducted in the emergency department at five hospitals in the Netherlands and included adults with acute wrist injury. All collaborating physicians performed a standardized physical examination and data were collected in a case report form. The main outcome was defined as the radiographic presence of a wrist fracture. Six clinical variables that were significantly associated with a fracture (ρ < 0.01) were included in a model to develop the clinical decision rule.
Results:
A total of 493 fractures in 724 patients were identified by radiographic assessment. Almost all of the clinical variables were associated with the presence of a fracture. Our decision rule had a sensitivity of 0.97 (95% CI 0.96-0.99) with a specificity of 0.26 (95% CI 0.20-0.32) in this validation cohort. Application of the decision rule resulted in a reduction in radiographic assessment rate of 10% at the cost of missing 2% of the fractures.
Conclusion:
The decision rule showed a high sensitivity and low specificity, possible due to the high pre-test probability of a wrist fracture in the cohort. Our study needs further validation in other populations.
