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Descending genicular artery (Articular branches)

The descending genicular artery is a terminal branch of the femoral artery, arising just before it passes through the adductor hiatus. It is an important contributor to the genicular anastomosis around the knee. Among its terminal branches, the articular branch descends toward the knee joint, participating in the vascular plexus that supplies the joint capsule, synovium, and periarticular structures.

This artery is clinically important in vascular surgeries, orthopedic procedures, trauma assessment, and imaging of the knee region.

Synonyms

  • Highest genicular artery

  • Articular branch of descending genicular artery

  • Superior descending genicular artery

Origin, Course, and Termination

  • Origin: Arises from the femoral artery in the distal thigh, proximal to the adductor hiatus

  • Course:

    • Passes medially and downward along with the saphenous nerve

    • Divides into two terminal branches: a saphenous branch and an articular branch

  • Termination (Articular branch):

    • Pierces the vastus medialis muscle

    • Reaches the medial aspect of the knee

    • Contributes to the genicular arterial anastomosis, joining with branches of the medial superior genicular and inferior genicular arteries

Branches

  • Saphenous branch: Travels with the saphenous nerve, supplying skin of medial leg and knee

  • Articular branch: Supplies periarticular tissues of the knee and participates in the genicular arterial network

Relations

  • Anteriorly: Vastus medialis muscle

  • Posteriorly: Adductor magnus tendon and femoral vessels

  • Medially: Saphenous nerve, fascia of adductor canal

  • Inferiorly: Knee joint capsule, contributing to vascular plexus

  • Laterally: Femoral artery and vein before termination

Function

  • Provides vascular supply to the knee joint capsule, synovium, and periarticular structures

  • Contributes to the rich genicular arterial anastomosis, ensuring collateral circulation around the knee

  • Plays a role in maintaining blood supply during flexion/extension and when major vessels are compromised

Clinical Significance

  • Important in collateral circulation of the knee when femoral or popliteal artery flow is compromised

  • May be visualized or targeted during angiography, MRA, or CTA for vascular assessment

  • Involved in trauma or vascular injury around distal femur/knee

  • Considered during knee surgeries, bypass grafting, or flap harvest

MRI Appearance

T1-weighted images:

  • Appears as a flow void (dark linear structure) due to rapid blood flow

  • Surrounded by intermediate-signal muscles and bright fat in the adductor canal

T2-weighted images:

  • Also appears as a flow void (dark linear channel) within surrounding tissues

  • Perivascular edema or pathology may show bright signal intensity

STIR (Short Tau Inversion Recovery):

  • Vessel wall and lumen show dark signal

  • Surrounding inflammatory or traumatic changes show bright signal

T1 Fat-Sat Post-Contrast (MRA):

  • Enhances brightly when contrast is given, showing arterial lumen

  • Pathology (occlusion, aneurysm, dissection) is well-demonstrated

MRA / CTA Appearance

  • MRA:

    • Articular branch is seen as a small enhancing vessel descending medially toward the knee

    • Best visualized with contrast-enhanced or time-of-flight MRA

    • Appears as part of the genicular arterial network

  • CTA:

    • Clearly demonstrates the artery as an enhancing tubular structure

    • High-resolution CTA can trace its contribution to the genicular anastomosis

    • Useful in detecting stenosis, aneurysm, trauma, or surgical planning

CT Appearance

Non-Contrast CT:

  • Artery not clearly seen without contrast; only surrounding fat planes may be visible

  • Calcifications within vessel wall may appear as small high-density foci

Post-Contrast CT (CTA):

  • Vessel enhances brightly as a tubular contrast-filled structure

  • Continuity with femoral artery proximally and genicular anastomosis distally is visible

  • Pathologies (trauma, occlusion, aneurysm, tumor encasement) are well depicted

MRI image

Descending genicular artery (articular branches) CORONAL cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000_00001

MRI image

Descending genicular artery axial cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

MRI image

Descending genicular artery (articular branches) CORONAL cross sectional anatomy 3T MRI AI enhanced radiology anatomy image-img-00000-00000

CT image

Descending genicular artery (articular branches) CT AXIAL