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📌 Anatomy of the Arcuate Ligament
- Y-shaped thickening of the posterolateral capsule
- Runs to apex of fibular styloid process
- Lateral limb attaches to lateral femoral condyle and posterolateral joint capsule
- Medial limb attaches to posterior knee capsule and oblique popliteal ligament
✅ Variability and Visualization
- Variably present structure
- Difficult to visualize directly on MRI even when present
✅ Key Point 1: No Need to Decipher Exact Anatomy
- Injury can be inferred from increased pericapsular signal around posterolateral capsule
- Torn medial limb seen posterior to popliteus tendon
- Integrity inferred from intact posterolateral joint line capsule
✅ Key Point 2: Sagittal Anatomy to Remember
- Popliteus tendon lies deepest, easy to identify
- Lateral inferior genicular vessel also easily seen
- Medial limb between popliteus and genicular vessel
- Fabellofibular ligament superficial to genicular vessel, connects to fabella
- If fabellofibular ligament prominent, lateral limb may be small/absent
RadioGraphics 2016; 36:1776–1791
RadioGraphics 2014; 34:496–513
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.
#ArcuateLigamentAnatomy, #PosterolateralKneeCapsule, #YShapedLigament, #LateralLimb, #MedialLimb, #PopliteusTendon, #LateralInferiorGeniculaVessel, #FabellofibularLigament,
#Knee, #MRI, #Anatomy, #Ligaments, #PosterolateralCorner, #ArcuateLigament, #PopliteusTendon, #GeniculaVessels, #FabellofibularLigament, #CapsuleIntegrity
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