[Anatomy_13] Lateral Meniscus Posterior Root - 01

 

 

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 region and posterior slope of lateral tubercle.

 

The PRLM inserts mainly in the intertubercular area with a thin, long anterior extension to the point just posteromedial to the tibial attachment of the ACL

It is delineated on MRI as a dark signal line parallel to the tibial plateau on mid-sagittal images and dark signal foci traversing the intertubercular crest on contiguous coronal images.

 

The minor component was attached to the posterior slope of the lateral tibial tubercle, anterior to the tibial attachment site of the PCL.

It appears as shorter striated fibers similar to other roots of menisci.

 

Superior-view drawing of the tibia shows the three attachment patterns of the PRLM

The majority of PRLM (76.2%) had two attachment sites: the medial tubercle along the intertubercular crest, just posteromedial to the tibial attachment of the anterior cruciate ligament (ACL), and the posterior slope of the lateral tubercle.

 

Solitary attachment to the posterior slope of the lateral tubercle

Solitary attachment to the medial tubercle along the intercondylar crest

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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