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The Posteromedial Corner: Semimembranosus Expansions part 2

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Knee anatomy.

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The posteromedial corner seen from a side view,

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demonstrating a semimembranosus coming down

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from posterosuperior to anteroinferior.

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The main tendon, which is known as the direct arm,

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which is deep, dark on MRI and fan-shaped,

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depicted here as a yellow...

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sorry,

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depicted here as an orange dotted structure,

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may then bifurcate into an anterior arm and the direct

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arm continues on down. The anterior component,

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or tibial arm, is also known as the reflected arm.

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It also goes by the name of pars reflexa.

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So, the direct arm is the arm that you're most likely

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to see. The other arms are more minor.

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Perhaps you may be able to see the distal arm when the

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knee is swollen and inflamed as the expansions may

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separate and you're unlikely to see

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the inferior popliteal arm.

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There's also a capsular arm that

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blends with the capsule,

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but it also blends with the capsular component

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of the POL or Posterior Oblique Ligament.

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So the knee capsule, POL,

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and the capsular reflection of the semimembranosus are one.

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More on the POL in a separate discussion.

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Description

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Trauma

Syndromes

Musculoskeletal (MSK)

MRI

Knee

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