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✅ Fabellofibular Ligament
- Originates from the fabella, runs vertically parallel to the lateral collateral ligament, and attaches to the fibular styloid process.
✅ Arcuate Ligament
- Thickening/reinforcement of the posterolateral capsule
- Y-shaped, runs to the apex of the fibular styloid process
- Lateral limb attaches to lateral femoral condyle and posterolateral joint capsule
- Medial limb attaches to posterior capsule and oblique popliteal ligament
✅ Visualizing These Ligaments on MRI
- Difficult to visualize arcuate and fabellofibular ligaments on MRI, even when present
- More conspicuous on non-fat-saturated MRI as surrounded by adipose tissue
📌 Identifying Ligament Injuries
- Increased pericapsular signal surrounding posterolateral capsule on fat-suppressed, fluid-sensitive MRI suggests injury
- In this case, more severe injuries with disruption of posterolateral capsule
- Tears of fabellofibular and arcuate ligaments evident
Radiographics. 2016 Oct;36(6):1776-1791.
RadioGraphics 2014; 34:496–513
Radiol Clin North Am. 2018 Nov;56(6):935-951.
Stoller's Orthopaedics and Sports Medicine: The Knee
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
© 2022 MSK MRI Jee Eun Lee All Rights Reserved.
No unauthorized reproduction, redistribution, or use for AI training.
#KneeAnatomy, #OrthoAnatomy, #FabellofibularLigament, #LateralKneeLigaments, #ArcuateLigament, #PosterolateralKneeLigaments, #KneeCapsuleAnatomy, #KneeMRI, #MSKImaging, #RadiologyTips, #LigamentTears, #KneeInjuries, #OrthoRadiology
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