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Posterior Root Tear

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Next case is a 41-year-old, uh, man

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with recurrent effusions

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and pain in the middle of a half marathon.

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So again, scrolling from medial to lateral.

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You can see again this nice, uh, ramp area meniscal,

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capsular, meniscal, tibial ligaments.

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All that is intact. Once we get into the intercondylar

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notch, you can see that the, uh, the PCL looks okay,

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but there's, um, this high grade tearing of, uh,

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of Humphrey, the meniscal femoral ligament of Humphrey.

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There's some cystic changes in this, uh,

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intracon or eminence.

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And as we get to the, uh, posterior root

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of the lateral meniscus, you can see that

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Humphrey merges on, uh, to the, to the posterior horn.

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But the short

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and long fibers, uh, there's partial tearing, um,

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of this posterior root of the lateral meniscus.

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On the coronal, you can actually see a gap between the, um,

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short fibers of the posterior root

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and the, uh, lateral meniscus

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and on, on the long fibers.

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Those are better appreciated on this,

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on this sagal slice right over here.

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And as we get to the body on the coronal, you can see

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that this thing extends, um,

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at least a couple, uh, millimeters.

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So this, this body is extruded.

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And the reason I wanted to show this was that, um, you have

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to pay attention, um, to this, these, these roots.

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Uh, they're commonly associated with ACL injuries,

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but in this case, the ACL was intact.

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Uh, and there was, um, a, uh, high grade tear,

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uh, arthroscopically.

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Uh, these high grade

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and complete tears, they all kind of look similar.

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And so this is similar to the, the prior case with the, uh,

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retrograde, uh, drill and the transtibial pullout repair.

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And that's the final product on the lower right.

Report

Faculty

Donald Resnick, MD

Professor Emeritus, Department of Radiology

University of California, San Diego

Mini N. Pathria, MD, FRCP(C)

Division Chief, Musculoskeletal Imaging

University of California San Diego

Eric Y. Chang, MD

Adjunct Professor, Radiology

University of California, San Diego

Brady K. Huang, MD

Clinical Professor of Radiology

UC San Diego Medical Center

Tags

Musculoskeletal (MSK)

MRI

Knee