A standardised computed tomography measurement method for distal fibular rotation
Sven Yves Vetter1, Martin Gassauer1, Lorenz Uhlmann2
1MINTOS-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.
Summary
This study identified 6 mm distal to the talar joint line as the ideal location for measuring fibular rotation using computed tomography (CT) scans, establishing a reliable method for ankle imaging.
Area of Science:
- Orthopedic imaging
- Anatomy
- Biomechanics
Background:
- Accurate measurement of fibular rotation is crucial for diagnosing and managing ankle joint pathologies.
- Standardized methods for assessing fibular rotation using computed tomography (CT) are needed.
Purpose of the Study:
- To determine the optimal anatomical landmark for measuring fibular rotation on axial CT scans of the ankle.
- To establish the average degree of fibular rotation in an uninjured cohort.
Main Methods:
- Standardized axial CT scans with coronal/sagittal reconstructions were obtained from 100 healthy individuals.
- Three investigators identified measurement points at 4, 6, 8, and 10 mm distal to the talar joint line.
- Inter- and intraobserver reliability and intraclass correlation coefficients (ICC) were calculated.
Main Results:
- The most frequent locations for measurement were 4 mm (31%) and 6 mm (51%) distal to the talar joint line.
- The average external rotation of the fibula was 8.42° ± 4.86° (range 0°-26°).
- Interrater and intrarater reliability (ICC) were 0.75, indicating good reproducibility.
Conclusions:
- A reproducible method for measuring fibular rotation in the ankle joint using CT has been established.
- The location 6 mm distal to the talar joint line offers the most reliable and convenient measurement point for fibular rotation.
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