Interactive Transcript
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Wrist anatomy, short axis, we're going
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to talk about the wimpy, amorphous
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ulnar and radial collateral ligaments.
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The ulnar collateral ligament goes from the styloid
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process of the ulna to the triangular fibrocartilage,
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so it sends fibers into the triangular fibrocartilage,
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but also to the triquetrum and to the pisiform.
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So these structures are part of the ulnar
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collateral ligament complex, including this one.
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Right here.
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The ulnar collateral complex is a rete of structures
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that are condensations of the ulnar capsule.
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They're interposed between the extensor carpi ulnaris
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subsheath and the filler ulno meniscus homolog.
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So often, you don't define the UCL
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as a single isolated structure.
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It's more laminated, as we see here,
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buried within other structures.
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It limits radial deviation.
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The radial collateral ligament goes from the
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styloid of the radius to the scaphoid, but also
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has components that go up to the trapezium or
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greater multangular, and it limits ulnar deviation.
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It's even more wimpy than its ulnar counterpart.
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If we try and cross-reference the radial collateral
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ligament, we can see that the radial collateral
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ligament, you see, it's somewhat difficult to do.
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There's a gray signal intensity structure here, and
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a little black condensation just peripheral to it.
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The same thing is true on the ulnar side.
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If we try and pick out a structure such as
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this one right here, going from the ulnar
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styloid to the triquetrum, we see that there
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are some ill-defined gray tissue structures
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on the T1 and the water-weighted image with a
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condensation of lower signal more peripherally.
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Not a single dominant structure that
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you can pick out, nor is it critical
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to do so for purposes of wrist injury.
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