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📌 Posteromedial Knee Recesses
✅ Superior Posteromedial Recess
- Borders: Superiorly by the medial femoral condyle, inferiorly by the superior part of the posterior meniscal horn, and posteriorly by the joint capsule.
- Characteristics: When the knee is flexed at 90 degrees during an MRI, this recess widens, while the inferior recess collapses, mimicking the arthroscopic view.
✅ Inferior Posteromedial Recess
- Borders: Posterior part of the meniscotibial ligament and the tibial plateau.
- Characteristics: Typically not accessible with arthroscopy and does not communicate with the superior recess. Prominence can mimic a ramp lesion.
📌 Sub-popliteus (Subpopliteal) Recess
- Located between the popliteus tendon and the posterior horn of the lateral meniscus.
- In about 10% of adults, this lining is continuous with the synovial membrane of the proximal tibiofibular joint.
- Loose bodies can sometimes be found here.
📌 Anterior Tibial Recess
- The anterior tibial recess is a normal capsular recess found just anterior to the proximal tibia.
- It can be observed from both the medial and lateral sides:
✅ Medial Anterior Tibial Recess:
- Smaller due to the tight connection via the medial coronary ligament, matching the concave medial tibial plateau.
✅ Lateral Anterior Tibial Recess:
- Larger due to the redundant lateral coronary ligament, corresponding to the convex and larger lateral tibial plateau.
References
- Insights Imaging (2013) 4:257–272
- J Korean Soc Radiol 2022;83(3):582-596
- Radiol Med. 2021 Aug;126(8):1106-1116
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
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#PosteriorMedialCapsule, #MeniscocapsularLigament, #MeniscotibialLigament, #KneeAnatomy, #SagittalMRI, #JointCapsule, #SubpopliteusRecess, #AnteriorTibialRecess, #MedialMeniscus, #KneeMRI
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