0:01

We're on wrist anatomy.

0:02

Extrinsics.

0:04

Yeah, they're hard.

0:05

We're looking at a short axis view with

0:09

the red arrow pointing to the volar radioulnar

0:11

ligament and the yellow arrow pointing

0:14

to the dorsal radioulnar ligament.

0:17

We know we're dorsal with the palm facing

0:19

up because here's Lister's tubercle

0:21

as a potential landmark.

0:24

Now we've said in the past that coming off, not the

0:27

ulna itself, but actually coming off this ligament.

0:30

So it's a ligamentous, the ligamentous origin is the

0:34

volar ulnocarpal ligaments, and the volar ulnolunate

0:39

ligaments, and the volar ulnotriquetral ligaments.

0:43

So injuries of this volar radioulnar

0:46

ligament can be a very destabilizing thing

0:49

because there are multiple volar ligaments

0:52

that come off it.

0:54

And these are actually coming at you, going from

0:57

proximal to distal, attaching to respective areas,

1:01

namely to the scapholunate ligament, to the lunate,

1:06

and to the triquetrum, is where they are headed.

1:09

Now the volar radioulnar ligament is

1:13

involved in stabilization of the radius

1:16

and ulna, specifically in supination.

1:19

And it is particularly compromised when

1:22

there is both a radioulnar volar ligament

1:25

transection and an interosseous membrane injury.

1:28

Let's have a look on MRI.

Diagramatic Anatomy: Extrinsic Ligaments Part 7

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0:01

We're on wrist anatomy.

0:02

Extrinsics.

0:04

Yeah, they're hard.

0:05

We're looking at a short axis view with

0:09

the red arrow pointing to the volar radioulnar

0:11

ligament and the yellow arrow pointing

0:14

to the dorsal radioulnar ligament.

0:17

We know we're dorsal with the palm facing

0:19

up because here's Lister's tubercle

0:21

as a potential landmark.

0:24

Now we've said in the past that coming off, not the

0:27

ulna itself, but actually coming off this ligament.

0:30

So it's a ligamentous, the ligamentous origin is the

0:34

volar ulnocarpal ligaments, and the volar ulnolunate

0:39

ligaments, and the volar ulnotriquetral ligaments.

0:43

So injuries of this volar radioulnar

0:46

ligament can be a very destabilizing thing

0:49

because there are multiple volar ligaments

0:52

that come off it.

0:54

And these are actually coming at you, going from

0:57

proximal to distal, attaching to respective areas,

1:01

namely to the scapholunate ligament, to the lunate,

1:06

and to the triquetrum, is where they are headed.

1:09

Now the volar radioulnar ligament is

1:13

involved in stabilization of the radius

1:16

and ulna, specifically in supination.

1:19

And it is particularly compromised when

1:22

there is both a radioulnar volar ligament

1:25

transection and an interosseous membrane injury.

1:28

Let's have a look on MRI.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

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Wrist MRI Mastery Series: Anatomy

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Wrist MRI Mastery Series: Anatomy - Focus on the TFC

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Diagramatic Anatomy: Extrinsic Ligaments Part 7