Upcoming Events
Log In
Pricing
Free Trial

Anterolateral Ligament

HIDE
PrevNext

0:00

So let's talk formally about the antola ligament.

0:04

The, uh, the

0:06

terminology about this ligament is somewhat confusing.

0:10

Um, and just to give you a brief history,

0:12

it was originally described in 2007 by Vira

0:15

and described just as the a LL.

0:18

But about five years later, another group by Vincent

0:21

basically said that we're talking about the same ligament.

0:24

The A LL is the mid third lateral capsular ligament.

0:29

But this was popularized, um, in 2013 by this article

0:33

by clays this anatomic description

0:35

where they described this a LL

0:37

and unfortunately described it

0:39

as a newly discovered ligament.

0:41

And the lab press sort of ran with it, thinking that, uh,

0:44

we had not known about this ligament for thousands of years,

0:47

but when in fact this is the same thing

0:49

that we have known about the mid third

0:50

lateral capsular ligament.

0:52

But we can identify it on MRI.

0:54

And this is again, how the lateral gict vessels can be a

0:58

nice useful landmark for looking

1:00

for this specific ligament instead

1:02

of the superior lateral canicula vessels.

1:05

This is the inferior lateral gen vessels

1:07

and again, red for artery.

1:09

And we have two paired veins

1:10

and we can see this ligament basically surrounding this

1:14

peripheral, uh, mid body of the lateral meniscus.

1:17

And here from this clay article two, they can,

1:20

they show these, um,

1:21

vessels traveling within the ant lateral ligament,

1:24

basically hugging the periphery of the body

1:26

of the lateral meniscus.

1:29

So here I provide with you a couple of different, uh,

1:33

different, uh, examples of the an lateral ligament.

1:37

Here's a patient who actually presented with insidious, uh,

1:40

lateral knee pain, no history of specific injury,

1:44

and she actually had aral insufficiency fracture.

1:47

And Dr. Resnick showed some fairly nice examples of this.

1:50

You can see the extended bone marrow p uh, edema pattern,

1:53

and you can see this focal thickening

1:55

of the subc chondral bone plate reflecting the presence

1:57

of this insufficiency fracture.

1:59

Again, no specific injury,

2:01

but the reactive soft tissue edema about the lateral aspect

2:05

of the knee does afford us the ability

2:07

to visualize the ant lateral ligament, again,

2:10

surrounding those lateral inferior gict vessels.

2:14

Here's a patient who, uh, suffered a basketball injury

2:17

and here you can see fibers of the ant,

2:20

lateral ligament inferiorly, a little bit thickened, uh,

2:23

and emus and also,

2:24

and its peripheral attachments to lateral meniscus.

2:27

A little bit thickened, but overall no gross

2:30

disruption or discontinuity.

2:32

So this is more of a ligamentous sprain.

2:34

Another patient, uh, juujitsu injury.

2:37

If we look at the superior fibers, we can see

2:39

that they're clearly disrupted

2:40

and even sort of rolled up on, on themselves,

2:43

whereas the inferior

2:44

or meniscal tibial component remains intact.

2:49

If we, uh, move to onto this last example of a patient

2:51

with a BA basketball injury injury, similar findings, again,

2:55

find those lateral inferior gent vessels

2:57

and you can find the peripheral, uh, meniscal tibial portion

3:00

of that ant lateral ligament.

3:02

And if we move up superiorly, we can see

3:04

that it's disrupted from its femoral attach.

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