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Extrinsic Ligaments: Thumb Part 3

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0:00

Wrist, extrinsics, anatomy, the thumb.

0:05

An important stabilizer, perhaps not the strongest,

0:08

but still an important one at the first CMC,

0:11

is the superficial anterior oblique ligament.

0:16

As anterior implies, it is a

0:19

volar or palmar positioned ligament.

0:22

If there's a superficial, there's gotta be also a deep.

0:26

And there is.

0:27

The deep is intraarticular.

0:30

It's a little shorter, therefore it gets taut in

0:33

extremes of motion before the superficial one does.

0:37

The superficial one tends to be a little more

0:40

thick and well-developed than the deeper one.

0:43

Together, in paired fashion, they prevent volar subluxation

0:49

of the base of the first metacarpal.

0:52

The superficial anterior oblique ligament,

0:56

extra-articular, and the deep anterior oblique ligament,

1:00

intra-articular with a shorter course, seen on MRI.

1:04

Let's scroll so you can follow the ligaments.

1:06

There they are.

1:07

And there they are in the next cut.

1:09

Superficial and deep.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Thumb & Finger

Musculoskeletal (MSK)

MRI

Idiopathic

Hand & Wrist

Congenital

Acquired/Developmental

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