Triangular Fibrocartilage: Focus on the Ulnar Styloid
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Let's focus on the ulnar styloid.
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It's a rather strange bird, especially in people
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that have negative ulnar variance, but even in
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other individuals, the styloid may be very long.
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And when it is long, it can impact
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on the adjacent triquetrum, leading
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to ulnotriquetral abutment syndrome.
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Sitting directly atop the ulnar styloid is, in this
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case, a small little brightish area right there.
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Known as the prestyloid recess.
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That recess can be contained as it is here.
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Or it can have a very narrow area of
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communication with the rest of the ulnar capsule.
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Or it can be hourglass-shaped with a free
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communication with the rest of the capsule.
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Or there can be none at all.
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So there's quite a bit of
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variability of this structure.
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Surrounding that tissue is the rather
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bland, somewhat uninteresting, nondescript,
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grayish tissue, which I'm coloring in here,
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representing the ulnomeniscal homolog.
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The slightly brighter tissue, which,
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you know what, I think I'll make white.
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I'll draw white on white.
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That's the capsule.
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So the capsule and the homolog are kind
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of mashed together in one big filler soup.
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Sometimes.
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You'll see a condensed linear structure.
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You might be able to hallucinate
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it here, you might not.
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Perhaps right here, which we might refer
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to as the ulnar collateral ligament.
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Even though it's merely a thickening of
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the ulnar capsule and not physiologically
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that important in the overall stabilization
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of ulnar-sided TFCC wrist structures.
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Then we run into something much more
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substantive, which I'm coloring in light blue.
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And that is the extensor carpi ulnaris subsheath,
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which helps stabilize the extensor carpi ulnaris,
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which is then surrounded by a superficial retinaculum,
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which you see better in the axial projection.
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And that's the story of the ulnar styloid
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and its surrounding peripheral structures.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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