Interactive Transcript
0:00
Let's zoom in on the capsulosynovial
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reflections of the distal radioulnar
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joint and the immediate adjacent ulna.
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Our triangular fibrocartilage attaches
0:13
to the hyaline cartilage of the radius.
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Now let's make the hyaline cartilage
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perhaps a little different color.
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Let's draw over it in orange.
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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.
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And between them, if you can imagine
0:42
it right there, is a thin slit.
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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,
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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.
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And I'm gonna make the fuzzy
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tissue, let's call it brown.
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This little fuzzy tissue right here.
1:40
Those are little synovial fronds
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associated with the capsule.
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So we've got some hyaline cartilage, we've got the
1:48
capsule in the synovium, we've got the triangular fibro-
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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
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capsule surrounded by fuzzy synovial tissue reflection,
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which is slightly white or brighter on both sides of
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this thin, dark slit running from distal to proximal.
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And then the hyaline cartilage of the
2:19
ulna, which we can see contributes and
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continues over the top of the ulnar body.
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