Coronal Anatomy: Extrinsic Ligaments Part 11
HIDEInteractive Transcript
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Wrist anatomy, extrinsics, dorsal. We've got a
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horizontal V shape for the key dorsal ligaments known
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as the dorsal intercarpal ligament right here, and
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the dorsal radiotriquetral ligament right here.
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Of the two, this one is probably a
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little more important, the distal one.
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I point out this configuration of a sideways V because
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on the volar aspect of the wrist, and this is how you
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tell where you are very quickly, the ligaments orient
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themselves in an inverted V, from distal to proximal.
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So when you see a sideways V,
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you're on the back of the wrist.
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When you see a V pointed from front to back or
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from distal to proximal, kind of like an arrow,
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you know you're on the volar aspect of the wrist.
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Now the dorsal intercarpal ligament goes
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from the dorsal tubercle of the triquetrum
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here to the dorsal groove, remember,
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on the back of the wrist of the scaphoid right here.
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This ligament also has attachments to the lunatotriquetral
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ligament and to the scapholunate ligament.
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It also attaches to the lunate itself directly,
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and about 50% of the time, it may also have
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some attachments to the adjacent multangular bones,
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although that's of lesser importance and significance.
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The attachments to the SL and LT ligaments is important
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because patients who have scapholunate dissociation
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frequently have rupture of one or both
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of these ligaments, especially this one,
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the dorsal intercarpal ligament.
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Let's have a look at one or
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both of these ligaments on MRI.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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