TO FIX OR NOT TO FIX? INTRA- AND INTER-OBSERVER AGREEMENT OF TREATMENT OF ANKLE FRACTURES

Abstract

Introduction: Large numbers of studies have been conducted to help the decision making of appropriate management of an ankle fracture.

Aim: To assess intra-observer and inter-observer agreement of treatment for ankle fracture based on plain radiographs.

Materials and Methods: Fifty patients with ankle fracture were randomly selected. Antero-posterior and lateral view ankle radiographs were blinded by the first author and then reviewed by five orthopaedic surgeons with varying clinical experience. The observers were asked for their opinion about how they would like to treat the fracture? They were provided with additional basic information of patient age, sex, mechanism of injury and associated comorbidities. This exercise was repeated again after four weeks. The kappa coefficient and observed agreement values were used for statistical analysis.

Results: The kappa values on both occasions were 0.41(SE: 0.084, 95% Confidence interval: 0.248–0.576, P< 0.00001) and 0.29(SE: 0.099, 95% confidence interval: 0.098 TO 0.487, P< 0.00001). These results show only fair inter-observer agreement.

The kappa values for intra-observer agreement were from 0.34 to 0.69 (P< 0.001) for different observers. The observed agreement for these observers was from 70% to 94%. Only two most senior observers had good agreement.

Conclusion: These results show that there is only fair inter-observer agreement of the treatment for ankle fracture based on plain radiographs and only senior clinicians were consistent about their preferred mode of treatment on both occasions. There is a need of clear guidelines and better understanding of biomechanics of Ankle Fractures to minimize the ‘grey’ zone of when to intervene.