The proportion of distal fibula Salter-Harris type I epiphyseal fracture in the paediatric population with acute ankle injury: a prospective MRI study.

Ankle injuries are common among the paediatric population. There are few prospective studies utilizing MRI to diagnose a clinically suspected Salter-Harris type I of the distal fibula (SH1FDF). The aim of this study was to examine the proportion of clinically suspected SH1FDF in children. All paediatric patients with ankle injury, seen at the emergency room from September 2012 to May 2013 at a single institution, underwent a standardized clinical examination, and their radiographs were obtained if found necessary. All images and data were recorded prospectively and patients suspected of having SH1FDF were referred for MRI of the ankle joint. Out of 391 paediatric patients seen at the emergency room with ankle injury, 38 patients had a clinical suspicion of SH1FDF. A total of 31 patients, 18 male and 13 female, with a mean age of 10 ± 2.86 years, were included in the study. Only seven patients were excluded from the study. MRI was obtained on an average of 6.9 ± 2.87 days. None of the included patients had evidence of SH1FDF on MRI. Our study and review of the literature verifies the high false-positive rate of clinically suspected SH1FDF. Most children had ligamentous lesions, bone contusion or joint effusion, rather than SH1FDF.