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The Anatomy of the Lateral Collateral Ligament Complex (LCL) on MRI

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So here we have an axial T2-weighted image showing the

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patella anteriorly. Easy for you to get oriented.

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And let's look at layer number one,

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our most superficial layer which consists of the iliotibial

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tract and its anterior expansion, which is right here.

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And it's going to insert as we follow it down

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onto Gerdy's tubercle in the tibia.

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And there's the anterior expansion best seen along Gerdy's tubercle.

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So now let's go up a little bit, back to where we were,

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and the superficial portion of the biceps femoris.

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So here's our big biceps muscle. Let's follow it.

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Here's some superficial biceps femoris.

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And then this posterior expansion right here. And the tissue,

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this wispy tissue immediately anterior to it is part

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of layer number one for the LCL.

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Layer number two,

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it consists of the quadriceps retinaculum anteriorly.

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So let's go to the quadriceps up high. Here's the quadriceps.

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And there is the quadriceps retinaculum,

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coming off the quadriceps tendon.

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And then two patellofemoral ligaments or retinaculum

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more posteriorly, which we won't point out right now

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since they're variably seen.

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Like the medial side,

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layers number one and two will merge or fuse together along with

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the patella, just like they do on the medial side,

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which has been articulated in a separate educational vignette.

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Layer number three, the deepest layer.

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It consists of the lateral joint capsules.

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Let's move over to the coronal projection for a moment

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and includes attachments to the lateral meniscus.

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Here's one of them right here.

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And the lateral capsular ligament,

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which is seen as this linear structure right here.

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There's the meniscofemoral ligament riding along the cortex

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of the tibia. Now we see it separated from it.

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And so these deep meniscocapsular components and the lateral capsule

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the medial capsule provide layer three on the medial side.

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Now, the LCL,

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which is sometimes used as a synonym for

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the fibular collateral ligament,

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takes off right up here near the lateral femoral condyle/epicondyle

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and sits above the origin of the popliteus hiatus.

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We follow it down. It's usually linear or slightly arc-shaped.

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It's located posteriorly.

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As you can see, we're in the posterior aspect of the knee,

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and it's located, although hard to appreciate between the superficial

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and deep divisions. I might blow that up a little bit for you.

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I'm going to blow it up. Deep division and superficial

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division right here of the capsule.

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It is considered a layer number two structure.

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And that's somewhat confusing.

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It comes on down and meets with its friend, the biceps femoris,

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to form the misnamed,

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now I'll zoom out, to form the misnamed conjoint tendon,

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which sits on top of and inserts on the fibular head.

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So, the LCL is a three-layered structure.

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Some of its anatomy is very analogous to the medial side, some not.

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Probably the least analogous is the fibular collateral

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ligament or lateral collateral ligament.

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And you could join us with other vignettes on this subject,

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including the posterior lateral corner.

Report

Description

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Trauma

Musculoskeletal (MSK)

MRI

Knee

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