• Winny Li, Jennifer Stimec, Mark Camp, Martin Pusic, Joshua Herman, and Kathy Boutis.
• Division of Emergency Medicine, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.
• J Emerg Med. 2022 Apr 1; 62 (4): 524-533.

BackgroundPediatric musculoskeletal (pMSK) radiograph interpretations are common, but the specific radiograph features at risk of incorrect diagnosis are relatively unknown.ObjectiveWe determined the radiograph factors that resulted in diagnostic interpretation challenges for emergency physicians (EPs) reviewing pMSK radiographs.MethodsEPs interpreted 1850 pMSK radiographs via a web-based platform and we derived interpretation difficulty scores for each radiograph in 13 body regions using one-parameter item response theory. We compared the difficulty scores by presence or absence of a fracture and, where applicable, by fracture location and morphology; significance was adjusted for multiple comparisons. An expert panel reviewed the 65 most commonly misdiagnosed fracture-negative radiographs to identify imaging features mistaken for fractures.ResultsWe included data from 244 EPs, which resulted in 185,653 unique interpretations. For elbow, forearm, wrist, femur, knee, and tibia-fibula radiographs, those without a fracture had higher interpretation difficulty scores relative to those with a fracture; the opposite was true for the hand, pelvis, foot, and ankle radiographs (p < 0.004 for all comparisons). The descriptive review demonstrated that specific normal anatomy, overlapping bones, and external artefact from muscle or skin folds were often mistaken for fractures. There was a significant difference in difficulty score by anatomic locations of the fracture in the elbow, pelvis, and ankle (p < 0.004 for all comparisons). Ankle and elbow growth plate, fibular avulsion, and humerus condylar fractures were more difficult to diagnose than other fracture patterns (p < 0.004 for all comparisons).ConclusionsWe identified actionable learning opportunities in pMSK radiograph interpretation for EPs.Copyright © 2021. Published by Elsevier Inc.

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