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Coronal Anatomy: Extrinsic Ligaments Part 3

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Welcome to MRI Online.

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The wrist extrinsic ligaments.

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We're talking about stabilization of the scaphoid,

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and no discussion of scaphoid stabilization

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would be complete without talking about

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the radioscaphocapitate, or sling ligament.

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It extends from the radial styloid in

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an arc-shaped fashion to the capitate.

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Now, there's some debate as to whether there

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is actual attachment to the scaphoid,

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or whether it just sits along the volar, or palmar,

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surface, preventing the scaphoid from rotating

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or pressing forward in a palmar orientation.

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Look at where it comes off, though.

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If you have a nasty little fracture through here,

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and it goes into the base of the radial styloid,

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you could interrupt this ligament and alter

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completely the entire biomechanics, or movement,

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of the wrist, and that wouldn't be a good thing.

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What else stabilizes the scaphoid?

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Well, obviously, the scapholunate ligament,

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which has three components, an interosseous,

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a dorsal, and a palmar component.

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And frequently, these two are injured

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together, so they both play a role in scaphoid

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stabilization, as does, in a previous vignette,

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the scaphotrapeziotrapezoid ligaments.

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Let's take a look at the MRI.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Non-infectious Inflammatory

Musculoskeletal (MSK)

MRI

Idiopathic

Hand & Wrist

Congenital

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