MSK MRI

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. The popliteal hiatus shows relatively symmetric posterosuperior and anteroinferior fascicles. More medial section of the hiatus shows the normal deficiency of the anteroinferior popliteomeniscal fascicle. le..

The anteroinferior and posterosuperior fascicles were seen on MRI in 97% of patients who had a normal lateral meniscus at arthroscopy Although 45 degree oblique coronal images have been recommended for visualization of the popliteomeniscal fascicles , these structures are often well visualized during the review of routine sagittal acquisitions of the knee The anteroinferior popliteomeniscal fasc..

The anteroinferior popliteomeniscal fascicle (yellow arrow) is seen to course from the inferior aspect of the lateral meniscus posteroinferiorly to blend with fibers of the popliteofibular ligament This fascicle is typically seen on sagittal slices where the fibular head is also visible. In another patient, a component of the anteroinferior popliteomeniscal fascicle which courses directly to the..

The posterosuperior popliteomeniscal fascicle forms the roof of the popliteus hiatus, extending from the posterosuperior margin of the lateral meniscus to the posterior capsule. The anteroinferior popliteomeniscal fascicle is a coronary ligament, which forms the floor of the popliteus hiatus. As the popliteus tendon passes laterally, it passes beneath the posterosuperior fascicle and above the a..

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 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..

PRLM has two attachment sites of the intertubercular region and the posterior slope of the lateral tubercle. Contiguous fat-suppressed PD coronal images with a posteroanterior direction demonstrate small, dark signal foci (white arrows) traversing the intertubercular crest and terminating on the medial tubercle, near the tibial attachment of the ACL. These green-yellow arrows show an intercondyl..

PRLM has two attachment sites of intertubercular region and posterior slope of lateral tubercle. This image shows an intercondylar crest insertion component among the two attachment sites. The PRLM inserts mainly in the intertubercular area. It is delineated on MRI as a dark signal line parallel to the tibial plateau on mid-sagittal images with an oblique course and longer length than other root..

The PRLM(lateral meniscus posterior root) provides secondary stability to the anterior cruciate ligament during pivot shift loading. The PRLM has unique features, including its course and configuration. An accurate anatomic understanding of the PRLM is clinically important because this region is difficult to fully visualize arthroscopically. PRLM has two attachment sites of intertubercular regio..

The anterior root of lateral meniscus is normally directed obliquely upward on sagittal images and frequently contains increased internal signal intensity. In this location, the increased signal intensity is sometimes referred to as “speckled.” The anterior root of the lateral meniscus differs from the anterior root of the medial meniscus because it often has a prominent fissured appearance simi..