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Superior medial genicular artery

The superior medial genicular artery is one of the key branches of the popliteal artery that participates in the vascular network around the knee. It arises above the medial condyle of the femur and courses medially to supply the knee joint capsule, medial collateral ligament, periosteum, and adjacent muscles. It plays a critical role in the genicular anastomosis, which maintains collateral circulation to the knee joint and distal limb during flexion or arterial occlusion.

Synonyms

  • Medial superior genicular artery

  • Arteria genus superior medialis (Latin)

  • Branch of popliteal artery (medial superior branch)

Origin, Course, and Branches

  • Origin: Arises from the popliteal artery above the medial femoral condyle, typically opposite the superior lateral genicular artery

  • Course:

    • Curves medially and anteriorly around the medial femoral condyle

    • Passes deep to the tendons of the adductor magnus and semimembranosus

    • Continues toward the anterior aspect of the knee where it joins the genicular arterial network

  • Branches:

    • Articular branches to the medial femoral condyle and knee capsule

    • Muscular twigs to adjacent medial thigh and knee flexor muscles

    • Anastomotic branches joining with the superior lateral genicular artery, inferior medial genicular artery, descending genicular artery, and recurrent tibial branches

Relations

  • Anteriorly: Capsule of the knee joint, medial femoral condyle

  • Posteriorly: Popliteal artery and vein, tibial nerve

  • Superiorly: Adductor magnus tendon, vastus medialis muscle

  • Inferiorly: Semimembranosus tendon and medial head of gastrocnemius

  • Medially: Medial collateral ligament of the knee and overlying soft tissues

Function

  • Provides arterial blood supply to the medial femoral condyle, medial capsule, and medial collateral ligament

  • Contributes to the periarticular genicular anastomosis, maintaining perfusion during knee movement or arterial compromise

  • Supports collateral flow to the lower limb if the femoral or popliteal artery is obstructed

Clinical Significance

  • Important in knee joint surgery and vascular reconstructions

  • Can be injured in distal femoral fractures or knee dislocations

  • A frequent contributor to collateral circulation in popliteal artery occlusive disease

  • Involved in hemarthrosis or vascular lesions around the knee such as pseudoaneurysms

  • Visualization important in preoperative vascular mapping and interventional embolization

MRI Appearance

T1-weighted images:

  • Artery appears as a flow void (dark linear/tubular structure) surrounded by intermediate soft tissue and fat

  • Adjacent fat appears bright, aiding vessel localization

T2-weighted images:

  • Lumen shows flow void (dark signal) in normal high-flow conditions

  • Surrounding fat and joint fluid help delineate its course

  • Thrombosed or slow-flow segments may appear bright

STIR (Short Tau Inversion Recovery):

  • Normal artery: dark signal (flow void)

  • Perivascular edema or inflammation appears bright

T1 Fat-Sat Post-Contrast:

  • Vessel wall and lumen show brisk homogeneous enhancement

  • Pathological lesions (aneurysm, pseudoaneurysm, vascular tumor) show focal enhancement patterns

CT Appearance

Non-Contrast CT:

  • Artery not well visualized unless calcified

  • Surrounding fat provides contrast for its location along medial femoral condyle

Post-Contrast CT (Conventional):

  • Enhances strongly, appearing as a bright vessel adjacent to the medial femoral condyle

  • May reveal stenosis, occlusion, or pseudoaneurysm

MRA and CTA Appearance

MRA (Magnetic Resonance Angiography):

  • Demonstrates artery as a bright enhancing tubular structure

  • 3D MRA reconstructions delineate its contribution to the genicular anastomosis

  • Useful for detecting stenosis, occlusion, or vascular anomalies

CTA (Computed Tomography Angiography):

  • Provides high-resolution 3D visualization of artery and branches

  • Shows its relation to the medial femoral condyle and other genicular vessels

  • Detects aneurysm, pseudoaneurysm, traumatic injury, or collateral development

  • Useful in surgical and interventional planning around the knee

MRI image

Superior medial genicular artery MRI AXIAL cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

MRI image

Superior medial genicular artery MRI CORONAL cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

Superior medial genicular artery CT AXIAL 1

Superior medial genicular artery CT AXIAL IMAGE

Superior medial genicular artery CT CORONAL