A clinical decision rule to reduce unnecessary radiographs in pediatric finger injuries.

ObjectiveTo develop and validate a Clinical Decision Rule (CDR) for paediatric finger trauma that reduces unnecessary radiographs while ensuring accurate identification of clinically significant fractures. DesignObservational, retrospective, single-center study. Medical records of patients aged 0-16 years presenting with finger trauma were reviewed to develop a CDR. Multivariate logistic regression analysis was performed to identify predictive variables. A diagnostic test study was then carried out to assess the performance of the developed CDR. Settingpaediatric emergency department of a secondary-level hospital. ParticipantsA total of 462 injured fingers from 411 patients. Main Outcome MeasuresSensitivity, specificity, positive and negative predictive values (PPV and NPV) for significant fractures; Absolute Risk Reduction (ARR), Relative Risk Reduction (RRR), and the Number Needed to Treat (NNT) for the reduction in X-rays requested and their 95% confidence interval (95% CI). ResultsA total of 411 patients (462 injured fingers) were included, with a mean age of 10.13 years (standard desviation 3.70) and 57.9% being male. Overall, 8.01% of cases had a fracture, with a significantly higher prevalence in males (10.38% vs. 4.95%, p = 0.0328). Multivariate logistic regression identified deformity (adjusted Odds Ratio (OR): 2.33x102), mid/distal phalanx injury (OR: 15.40), impaired function (OR: 9.48), and hyperextension/flexion mechanism (OR: 5.37) as significant predictors. A CDR was developed with 100% sensitivity (95% CI 65.55 to 100) and 100% NPV (95% CI 98.11 to 100) for detecting clinically significant fractures. Applying the rule reduce 41.87% (ARR 95% CI: 36.20 to 47.55%) of radiographs, with an estimated annual cost saving of {euro}2,650. ConclusionsThis CDR is a reliable tool for identifying patients at risk of significant fractures in finger trauma. It safely reduces radiograph use, decreases radiation exposure, and optimizes healthcare costs. Further external validation through prospective studies is needed. KEY MESSAGESO_ST_ABSWhat is already known on this topicC_ST_ABSNo validated clinical decision rule exists for paediatric finger trauma, despite the high frequency of such injuries and the frequent overuse of radiographs. While clinical decision rules in other anatomical regions (e.g., ankle, knee) have proven effective in reducing unnecessary imaging, similar tools have not been validated for hand trauma in children. What this study addsThis study proposes a clinical decision rule for paediatric finger trauma, based on a retrospective analysis. The rule demonstrated high diagnostic performance, with 100% sensitivity and negative predictive value for significant fractures, and could potentially reduce radiograph use by over 40%. How this study might affect research, practice or policyAlthough external and prospective validation is still required, this clinical decision rule shows promise as a future tool to optimise decision-making in paediatric finger trauma. If validated, it may contribute to reduce unnecessary radiographs, improving emergency department workflow, and minimising radiation exposure in children.