0:00

Let's zoom in on the capsulosynovial

0:03

reflections of the distal radioulnar

0:05

joint and the immediate adjacent ulna.

0:10

Our triangular fibrocartilage attaches

0:13

to the hyaline cartilage of the radius.

0:19

Now let's make the hyaline cartilage

0:21

perhaps a little different color.

0:22

Let's draw over it in orange.

0:26

And you can see the hyaline cartilage continuing down

0:28

into the distal radioulnar joint on the radial side.

0:32

Yes, there is also hyaline cartilage

0:36

on the ulnar side.

0:39

And between them, if you can imagine

0:42

it right there, is a thin slit.

0:46

That thin slit is the joint.

0:50

The fuzzy tissue on either side of the thin slit is

0:54

synovium, normal synovium, sitting atop of the capsule.

1:00

Now let's roll our eye over to this area,

1:03

which is off the source of confusion.

1:08

Here we have the hyaline cartilage of the

1:11

ulna, which we've already colored in green.

1:13

Let's continue it on.

1:14

Hyaline cartilage in green.

1:17

And it gets a little thicker right there, doesn't it?

1:20

There's our triangular fibrocartilage,

1:22

not our hyaline cartilage.

1:24

And now we have another layer right there.

1:26

This thin, slit, dark layer is the

1:29

collapsed, non-distended capsule.

1:32

The fuzzy tissue.

1:34

And I'm gonna make the fuzzy

1:36

tissue, let's call it brown.

1:38

This little fuzzy tissue right here.

1:40

Those are little synovial fronds

1:43

associated with the capsule.

1:45

So we've got some hyaline cartilage, we've got the

1:48

capsule in the synovium, we've got the triangular fibro-

1:52

cartilage, we haven't colored it, but we've got the

1:55

hyaline cartilage of the lunate, we've got the hyaline

1:59

cartilage of the radius, we've got the collapsed

2:02

capsule surrounded by fuzzy synovial tissue reflection,

2:08

which is slightly white or brighter on both sides of

2:12

this thin, dark slit running from distal to proximal.

2:17

And then the hyaline cartilage of the

2:19

ulna, which we can see contributes and

2:22

continues over the top of the ulnar body.

Triangular Fibrocartilage: Capsulo-synovial Reflections

HIDE

Prev Next

Interactive Transcript

Pro Tip: Click on a word in the transcript to jump to that point in the video

0:00

Let's zoom in on the capsulosynovial

0:03

reflections of the distal radioulnar

0:05

joint and the immediate adjacent ulna.

0:10

Our triangular fibrocartilage attaches

0:13

to the hyaline cartilage of the radius.

0:19

Now let's make the hyaline cartilage

0:21

perhaps a little different color.

0:22

Let's draw over it in orange.

0:26

And you can see the hyaline cartilage continuing down

0:28

into the distal radioulnar joint on the radial side.

0:32

Yes, there is also hyaline cartilage

0:36

on the ulnar side.

0:39

And between them, if you can imagine

0:42

it right there, is a thin slit.

0:46

That thin slit is the joint.

0:50

The fuzzy tissue on either side of the thin slit is

0:54

synovium, normal synovium, sitting atop of the capsule.

1:00

Now let's roll our eye over to this area,

1:03

which is off the source of confusion.

1:08

Here we have the hyaline cartilage of the

1:11

ulna, which we've already colored in green.

1:13

Let's continue it on.

1:14

Hyaline cartilage in green.

1:17

And it gets a little thicker right there, doesn't it?

1:20

There's our triangular fibrocartilage,

1:22

not our hyaline cartilage.

1:24

And now we have another layer right there.

1:26

This thin, slit, dark layer is the

1:29

collapsed, non-distended capsule.

1:32

The fuzzy tissue.

1:34

And I'm gonna make the fuzzy

1:36

tissue, let's call it brown.

1:38

This little fuzzy tissue right here.

1:40

Those are little synovial fronds

1:43

associated with the capsule.

1:45

So we've got some hyaline cartilage, we've got the

1:48

capsule in the synovium, we've got the triangular fibro-

1:52

cartilage, we haven't colored it, but we've got the

1:55

hyaline cartilage of the lunate, we've got the hyaline

1:59

cartilage of the radius, we've got the collapsed

2:02

capsule surrounded by fuzzy synovial tissue reflection,

2:08

which is slightly white or brighter on both sides of

2:12

this thin, dark slit running from distal to proximal.

2:17

And then the hyaline cartilage of the

2:19

ulna, which we can see contributes and

2:22

continues over the top of the ulnar body.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Lesson

Wrist MRI Mastery Series: Pre-Course Activities

Lesson

Wrist MRI Mastery Series: Introduction to Wrist Imaging

Lesson

Wrist MRI Mastery Series: Imaging Techniques & Protocols

Lesson

Wrist MRI Mastery Series: Anatomy

Lesson

Wrist MRI Mastery Series: Anatomy - Focus on the TFC

Lesson

Wrist MRI Mastery Series: Case Review

Lesson

Wrist MRI Mastery Series: Surgical Perspective - Case Review

Triangular Fibrocartilage: Capsulo-synovial Reflections