Coronal Anatomy: Extrinsic Ligaments Part 3
HIDEInteractive Transcript
0:01
Welcome to MRI Online.
0:02
The wrist extrinsic ligaments.
0:06
We're talking about stabilization of the scaphoid,
0:09
and no discussion of scaphoid stabilization
0:13
would be complete without talking about
0:15
the radioscaphocapitate, or sling ligament.
0:19
It extends from the radial styloid in
0:22
an arc-shaped fashion to the capitate.
0:26
Now, there's some debate as to whether there
0:27
is actual attachment to the scaphoid,
0:30
or whether it just sits along the volar, or palmar,
0:34
surface, preventing the scaphoid from rotating
0:37
or pressing forward in a palmar orientation.
0:41
Look at where it comes off, though.
0:43
If you have a nasty little fracture through here,
0:45
and it goes into the base of the radial styloid,
0:48
you could interrupt this ligament and alter
0:51
completely the entire biomechanics, or movement,
0:54
of the wrist, and that wouldn't be a good thing.
0:56
What else stabilizes the scaphoid?
1:00
Well, obviously, the scapholunate ligament,
1:02
which has three components, an interosseous,
1:05
a dorsal, and a palmar component.
1:07
And frequently, these two are injured
1:09
together, so they both play a role in scaphoid
1:13
stabilization, as does, in a previous vignette,
1:17
the scaphotrapeziotrapezoid ligaments.
1:22
Let's take a look at the MRI.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
© 2024 MRI Online. All Rights Reserved.