(Fig 4-D.14) Anatomical Knee Recesses: Part 2

https://youtu.be/RUwwozeZKoc

https://youtu.be/YiEAI7pISIU

 

 

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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.

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📌 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.

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📌 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

1. Insights Imaging (2013) 4:257–272
2. J Korean Soc Radiol 2022;83(3):582-596
3. Radiol Med. 2021 Aug;126(8):1106-1116

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#PosteriorMedialCapsule, #MeniscocapsularLigament, #MeniscotibialLigament, #KneeAnatomy, #SagittalMRI, #JointCapsule, #SubpopliteusRecess, #AnteriorTibialRecess, #MedialMeniscus, #KneeMRI