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Inferior lateral genicular vein

The inferior lateral genicular vein is a venous tributary of the knee joint that accompanies the inferior lateral genicular artery. It participates in the venous drainage of the lateral aspect of the knee, forming part of the genicular venous network which communicates extensively around the knee joint. This vein drains into the popliteal vein and plays a crucial role in venous return from periarticular structures of the knee.

Synonyms

  • Inferior external genicular vein

  • Lateral inferior genicular vein

  • Venous tributary of the popliteal fossa (lateral branch)

Origin, Course, and Branches

  • Origin: Arises from venous channels around the lateral tibial condyle and anterior-lateral knee joint capsule

  • Course:

    • Runs transversely below the lateral tibial condyle, following the course of the inferior lateral genicular artery

    • Passes beneath the lateral collateral ligament and over the head of the fibula

    • Terminates by draining into the popliteal vein within the popliteal fossa

  • Branches:

    • Small tributaries from the anterior knee joint capsule

    • Communicating branches with the superior lateral genicular vein and inferior medial genicular vein

    • Connections with the anterior tibial recurrent veins

Relations

  • Anteriorly: Tibialis anterior muscle, anterior capsule of the knee joint

  • Posteriorly: Popliteus muscle, popliteal vein

  • Superiorly: Lateral condyle of femur, superior lateral genicular vessels

  • Inferiorly: Head of fibula, anterior tibial recurrent vessels

  • Laterally: Fibular collateral ligament

  • Medially: Popliteal vessels

Function

  • Provides venous drainage from the lateral compartment of the knee joint

  • Contributes to the periarticular venous anastomosis of the knee

  • Facilitates collateral venous return when the popliteal vein is compressed during knee flexion

Clinical Significance

  • Important in MR venography and CT venography for mapping periarticular venous collaterals

  • May be enlarged in chronic venous insufficiency or collateral circulation following venous thrombosis

  • Surgical and interventional relevance in popliteal fossa approaches

  • Can mimic vascular malformations or small cystic structures if not identified correctly

MRI Appearance

T1-weighted images:

  • Vein appears as a tubular low-signal structure

  • Flow void present when patent

T2-weighted images:

  • Flowing blood shows signal void

  • Thrombosis appears as bright intraluminal signal in acute phase, or dark chronic thrombus

STIR (Short Tau Inversion Recovery):

  • Patent vein: remains dark (flow void)

  • Thrombosis: bright hyperintense signal intraluminally

T1 Fat-Sat Post-Contrast:

  • Vein enhances with contrast as a bright linear structure

  • Thrombosed segments do not enhance, showing filling defects

MRV (Magnetic Resonance Venography) Appearance

  • Inferior lateral genicular vein appears as a small enhancing venous channel around the lateral tibial condyle

  • Clear continuity with the popliteal vein

  • Collaterals and periarticular venous network are well demonstrated

  • Thrombosis appears as non-opacified or absent venous segment

CTV (CT Venography) Appearance

Non-Contrast CT:

  • Vein not usually visible unless thrombosed (hyperdense acute clot may be seen)
    Post-Contrast CT Venography:

  • Vein opacifies as a thin enhancing vessel adjacent to the lateral tibial condyle

  • Connections with superior genicular and anterior tibial recurrent veins are visible

  • Thrombosis appears as a filling defect or non-opacified venous segment

MRI images

inferior lateral genicular vein coronal cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

MRI images

inferior lateral genicular vein axial cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000