✅ The calcaneofibular ligament (CFL) is the second most commonly injured ligament in lateral ankle sprains, following the anterior talofibular ligament (ATFL).
Understanding its anatomy and imaging characteristics is critical for accurate diagnosis.
- Orientation: It follows a curved course, requiring evaluation in multiple imaging planes.
- Dimensions: Rounded in cross-section, with a diameter of 6–8 mm and a length of ~20 mm.
✅ MRI Identification
- Axial view: The CFL lies deeper than the peroneus brevis and longus tendons
- Sagittal View:CFL is located between the ATFL (anteriorly) and PTFL (posteriorly). Appears as a low-signal band originating from the anterior lateral malleolus.
- Coronal View:Positioned deeper than the peroneus brevis and longus tendons. Particularly well-visualized on the fibular side.
✅Functional and Structural Insights
- Connections: The CFL and inferior ATFL fascicle share a common fibular insertion.
- LFTCL Complex: These ligaments are connected by arciform fibers, forming the lateral fibulotalocalcaneal ligament (LFTCL) complex, which has both anatomical and functional significance.
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