[Anatomy_16] Overview of the popliteomeniscal fascicles

 

The LM has a loose attachment to the joint capsule and to the femur and tibia by means of the meniscal ligaments and is not anchored to the lateral collateral ligament (LCL).

Posterior oblique drawing demonstrates posterolateral restraints of the lateral meniscus including the posterosuperior popliteomeniscal fascicle (PSF), anteroinferior popliteomeniscal fascicle (AIF), meniscofemoral ligament (MFL)

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The major attachments of the posterior horn of the lateral meniscus are the popliteomeniscal fascicles and the meniscofemoral ligaments.

At the posterolateral corner of the knee joint, the LM is attached to the joint capsule by the posterosuperior and anteroinferior fascicles.

 

The most commonly described popliteomeniscal fascicles are the anteroinferior(strongest), posterosuperior, and posteroinferior.

posteroinferior, which is not shown. 

The posteroinferior popliteomeniscal fascicle (arrow) is the least consistently visualized of the fascicles

 

Beginning at the lateral aspect of the lateral compartment, the anteroinferior popliteomeniscal fascicle is seen to course from the inferior aspect of the lateral meniscus posteroinferiorly to blend with fibers of the popliteofibular ligament.

 

​​The posterosuperior popliteomeniscal fascicle is visualized medially to the anteroinferior popliteomeniscal fascicle as the popliteus tendon penetrates the meniscocapsular junction.

 

The popliteomeniscal fascicles arise from the periphery of the posterior horn of the lateral meniscus and form a posterolateral meniscocapsular extension, which creates the popliteus hiatus. 

Contraction of the popliteus muscle results in posterior movement of the lateral meniscus during flexion. 

Disruption of these fascicles allows increased meniscal movement, meniscal subluxation, and even locking of the knee.

Tearing of the posterosuperior fascicle is highly associated with tears of the posterior horn of the lateral meniscus.

It's not a real patient's MRI, but they are virtual images very similar to the images in the journals. The images will be created for educational purposes.

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