Interactive Transcript
0:01
Welcome to MRI Online, coronal evaluation
0:04
of hyaline cartilage anatomy, and we've
0:06
got lots of it, and it looks terrific.
0:09
The hyaline cartilage is gray or
0:11
intermediate on the T1-weighted image.
0:13
You can see the capitate hyaline
0:15
cartilage, a slit of dark signal, and
0:19
then the adjacent scaphoid, capitate side
0:23
of hyaline cartilage.
0:25
So this is scaphoid cartilage, thin slit of collapsed
0:28
capsule, and hyaline cartilage of the capitate.
0:31
And so the same thing exists over here
0:33
in the hamate, where we have a beautiful
0:36
depiction of the hamate cartilage.
0:39
If you add up the normal cartilage of the wrist
0:42
from two adjacent bones, it's usually about
0:45
2.5 millimeters on average.
0:50
Now, one thing that's helpful to look at, especially
0:53
as an indirect sign of instability, any kind of
0:57
instability, whether it's radial ulnar instability,
1:00
scapholunate or lunotriquetral instability,
1:04
or midcarpal space instability, is the thickness of
1:07
the cartilage, the presence or absence of erosions
1:10
or swelling, defects, and adjacent synovitis.
1:15
These indirect signs are invaluable
1:18
in telling you what's going on.
1:22
The hyaline cartilage of the scaphoid
1:23
fossa is a terrific marker for the
1:26
early development of slack wrist.
1:29
The hyaline cartilage of the radial side of
1:33
the ulna and of the base of the ulnar side
1:37
of the lunate wear out early on in patients.
1:41
that have ulno lunate impingement or abutment syndrome.
1:46
Patients with failure of this ligament may
1:48
develop erosions in the scapholunate space.
1:51
Patients with lunato triquetral instability
1:54
may develop erosions in this space and
1:56
rarely will you have a situation where the
2:00
ligament is sick and the cartilage is normal.
2:02
So this indirect sign is reliable.
2:06
Let me return for a moment to A brief
2:09
discussion of this cartilage right here.
2:12
This is the cartilage that's going to tell you,
2:16
along with the triangular fibrocartilage, whether
2:19
you have abnormalities of variance between the ulna
2:22
and the radius with ulno lunate abutment syndrome.
2:26
And that's a subject for its own vignette.
2:30
Variance of the ulna relative to the radius.
© 2024 MRI Online. All Rights Reserved.