0:00

Let's focus on the ulnar styloid.

0:04

It's a rather strange bird, especially in people

0:08

that have negative ulnar variance, but even in

0:10

other individuals, the styloid may be very long.

0:14

And when it is long, it can impact

0:17

on the adjacent triquetrum, leading

0:19

to ulnotriquetral abutment syndrome.

0:22

Sitting directly atop the ulnar styloid is, in this

0:26

case, a small little brightish area right there.

0:29

Known as the prestyloid recess.

0:32

That recess can be contained as it is here.

0:36

Or it can have a very narrow area of

0:39

communication with the rest of the ulnar capsule.

0:43

Or it can be hourglass-shaped with a free

0:46

communication with the rest of the capsule.

0:49

Or there can be none at all.

0:51

So there's quite a bit of

0:53

variability of this structure.

0:55

Surrounding that tissue is the rather

0:58

bland, somewhat uninteresting, nondescript,

1:02

grayish tissue, which I'm coloring in here,

1:06

representing the ulnomeniscal homolog.

1:10

The slightly brighter tissue, which,

1:13

you know what, I think I'll make white.

1:15

I'll draw white on white.

1:17

That's the capsule.

1:18

So the capsule and the homolog are kind

1:20

of mashed together in one big filler soup.

1:26

Sometimes.

1:27

You'll see a condensed linear structure.

1:30

You might be able to hallucinate

1:32

it here, you might not.

1:33

Perhaps right here, which we might refer

1:36

to as the ulnar collateral ligament.

1:39

Even though it's merely a thickening of

1:42

the ulnar capsule and not physiologically

1:46

that important in the overall stabilization

1:49

of ulnar-sided TFCC wrist structures.

1:52

Then we run into something much more

1:54

substantive, which I'm coloring in light blue.

1:59

And that is the extensor carpi ulnaris subsheath,

2:03

which helps stabilize the extensor carpi ulnaris,

2:07

which is then surrounded by a superficial retinaculum,

2:11

which you see better in the axial projection.

2:14

And that's the story of the ulnar styloid

2:17

and its surrounding peripheral structures.

Triangular Fibrocartilage: Focus on the Ulnar Styloid

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0:00

Let's focus on the ulnar styloid.

0:04

It's a rather strange bird, especially in people

0:08

that have negative ulnar variance, but even in

0:10

other individuals, the styloid may be very long.

0:14

And when it is long, it can impact

0:17

on the adjacent triquetrum, leading

0:19

to ulnotriquetral abutment syndrome.

0:22

Sitting directly atop the ulnar styloid is, in this

0:26

case, a small little brightish area right there.

0:29

Known as the prestyloid recess.

0:32

That recess can be contained as it is here.

0:36

Or it can have a very narrow area of

0:39

communication with the rest of the ulnar capsule.

0:43

Or it can be hourglass-shaped with a free

0:46

communication with the rest of the capsule.

0:49

Or there can be none at all.

0:51

So there's quite a bit of

0:53

variability of this structure.

0:55

Surrounding that tissue is the rather

0:58

bland, somewhat uninteresting, nondescript,

1:02

grayish tissue, which I'm coloring in here,

1:06

representing the ulnomeniscal homolog.

1:10

The slightly brighter tissue, which,

1:13

you know what, I think I'll make white.

1:15

I'll draw white on white.

1:17

That's the capsule.

1:18

So the capsule and the homolog are kind

1:20

of mashed together in one big filler soup.

1:26

Sometimes.

1:27

You'll see a condensed linear structure.

1:30

You might be able to hallucinate

1:32

it here, you might not.

1:33

Perhaps right here, which we might refer

1:36

to as the ulnar collateral ligament.

1:39

Even though it's merely a thickening of

1:42

the ulnar capsule and not physiologically

1:46

that important in the overall stabilization

1:49

of ulnar-sided TFCC wrist structures.

1:52

Then we run into something much more

1:54

substantive, which I'm coloring in light blue.

1:59

And that is the extensor carpi ulnaris subsheath,

2:03

which helps stabilize the extensor carpi ulnaris,

2:07

which is then surrounded by a superficial retinaculum,

2:11

which you see better in the axial projection.

2:14

And that's the story of the ulnar styloid

2:17

and its surrounding peripheral structures.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

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Triangular Fibrocartilage: Focus on the Ulnar Styloid