The Posteromedial Corner: Semimembranosus Expansions part 3
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Knee anatomy.
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Postromedial corner on MRI, the semimembranosus expansions.
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Couple of highlights.
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The main semimembranosus expansion,
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also known as the direct or deep arm, depicted here in orange.
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I'll make my orange blue now,
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just so you can see it a little better right there.
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And the bifurcation between the anterior reflected arm and the
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continuation of the direct arm occurs slightly
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above the joint line.
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In fact, I'll even change color so you can see where it is.
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I'll make it orange.
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And then there's also another reflection or expansion called
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the capsular arm. And that's even more proximal.
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It's right about here.
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So it's about 2 cm above the joint line,
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where it will join the capsule of the POL.
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Now as we've said, the main direct arm, which is deep,
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is going to insert on a small bump or protuberance
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of the tibia called the tuberculum tendinous.
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There's also a small amount of tissue that's found in this
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little groove right here along the back of the tibia.
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Now, just before the tibial attachment, the direct arm,
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this one right here,
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is going to have some fibers that go to
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the inferior meniscotibial ligament,
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also known as the coronary ligament
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of the postromedial meniscus.
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So the meniscus and its attachment are intertwined with
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the main deep fibers of the semimembranosus tendon.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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