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Extrinsic Ligaments: Thumb Part 3

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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,

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is the superficial anterior oblique ligament.

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As anterior implies, it is a

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volar or palmar positioned ligament.

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

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And there is.

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The deep is intraarticular.

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

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extremes of motion before the superficial one does.

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The superficial one tends to be a little more

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thick and well-developed than the deeper one.

0:43

Together, in paired fashion, they prevent volar subluxation

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of the base of the first metacarpal.

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The superficial anterior oblique ligament,

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extra-articular, and the deep anterior oblique ligament,

1:00

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

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Let's scroll so you can follow the ligaments.

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There they are.

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And there they are in the next cut.

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Superficial and deep.

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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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