• Sven Yves Vetter, Martin Gassauer, Lorenz Uhlmann, Benedict Swartman, Marc Schnetzke, Holger Keil, Jochen Franke, Paul Alfred Grützner, and Nils Beisemann.
• MINTOS-Medical Imaging and Navigation in Trauma and Orthopaedic Surgery, BG Trauma Center Ludwigshafen at Heidelberg University Hospital, Ludwig-Guttmannstr. 13, 67071, Ludwigshafen am Rehin, Germany.
• Eur J Trauma Emerg Surg. 2021 Aug 1; 47 (4): 891-896.

PurposeThe aim of the study is to identify an ideal location to measure fibular rotation in the ankle joint using axial computed tomography (CT) scans. Another objective was to detect the average fibular rotation in the uninjured ankle joint in a large cohort.MethodsStandardised axial CT with coronal/sagittal reconstructions was performed in healthy ankle joints. Three investigators performed the measurements. In the axial view, each investigator appointed the ideal location to measure the angle of fibular rotation with the use of reference lines either 4, 6, 8 or 10 mm distal from the talar joint line. Inter- and intraobserver reliability, as well as the intraclass correlation coefficient, were determined.ResultsCT scans of one hundred individuals-78 males and 22 females-were analysed. The most common locations for measuring the fibular rotation were in 31% of cases 4 mm and in 51% of cases 6 mm distal the talar joint line. The external rotation of the fibula averaged 8.42° ± 4.86° (range 0°-26°). The intraclass coefficient correlations (ICC) for interrater and intrarater reliability were 0.75.ConclusionsThe results of the study demonstrate a reproducible location to measure the fibular rotation in the ankle joint. The most convenient location to measure fibular rotation with a high reliability was 6 mm distal to the talar joint line.© 2019. Springer-Verlag GmbH Germany, part of Springer Nature.

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