Triangular Fibrocartilage: Cartilage Anatomy
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Wrist TFC anatomy and its relationship
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to the surrounding hyaline cartilage.
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The TFC, as you know, is a fibrocartilaginous
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structure that is allegedly triangular,
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but in the coronal projection, not so much.
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Looks a little more like a trapezoid.
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It does look triangular when you view
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it from the axial projection on FOS.
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But that will be a story for another discussion.
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I'm interested right now in the cartilage
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that surrounds this structure, the
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hyaline cartilage, which is drawn in our
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illustration along the body of the ulna.
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There's also some hyaline cartilage in the
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fovea, which can be damaged, especially in
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impaction, pronation, supination injuries.
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This is a very annoying problem
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to have and difficult to treat.
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Along the ulnar margin of the radius
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is also a slit of hyaline cartilage.
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And this, unfortunately, is often confused for
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a radial attachment tear or a pseudodefect.
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First, tears or avulsions in
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this location are the rarest.
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They hardly ever occur.
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I have seen less than five in my entire career.
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So if you're diagnosing one, chances are you're wrong.
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You're simply looking at the hyaline cartilage.
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There's also hyaline cartilage
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along the base of the lunate.
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And it is this hyaline cartilage, along with
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the hyaline cartilage of the ulna, that wears in
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patients that have ulno-lunate impaction syndrome.
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Yes, there's also hyaline cartilage along the
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triquetrum and all the other carpal bones, but
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I'm less interested in that hyaline cartilage
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for this specific vignette discussion.
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So that's the surrounding hyaline cartilage
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milieu around our triangular fibrocartilage.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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