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Deep plantar arterial arch

The deep plantar arterial arch (also known as the plantar arterial arch) is the principal arterial structure supplying the plantar aspect of the foot. It lies deep within the sole, formed mainly by the deep plantar branch of the dorsalis pedis artery anastomosing with the lateral plantar artery, a terminal branch of the posterior tibial artery.

This arch forms a crucial vascular connection between the dorsal and plantar circulations of the foot. It lies close to the bases of the metatarsals, giving off branches that supply the metatarsal spaces, toes, and surrounding muscles. The deep location and compact anatomical relationships make it clinically important in trauma, ischemia, diabetic foot disease, and vascular imaging.

Synonyms

  • Plantar arterial arch

  • Arcuate artery of the sole

  • Deep plantar arch of the foot

Formation and Course

  • Formation: Formed by the union of the deep plantar branch of the dorsalis pedis artery (from anterior tibial artery) with the lateral plantar artery (from posterior tibial artery).

  • Course: Runs transversely across the plantar aspect of the foot, just anterior to the bases of the metatarsal bones, deep to the adductor hallucis muscle.

  • Termination: Ends at the lateral side of the foot, giving rise to plantar metatarsal arteries that divide into digital branches for the toes.

Branches

  • Four plantar metatarsal arteries → supply intermetatarsal spaces and toes via proper plantar digital arteries.

  • Perforating branches → connect with dorsal metatarsal arteries, forming dorsal–plantar anastomoses.

  • Muscular branches → supply deep plantar muscles including adductor hallucis and interossei.

Relations

  • Superiorly: Bases of the metatarsal bones and interosseous muscles

  • Inferiorly: Oblique head of adductor hallucis and plantar aponeurosis (deep surface)

  • Medially: Deep branch of the lateral plantar nerve

  • Laterally: Lateral plantar artery and nerve

  • Anteriorly: Plantar metatarsal arteries arising from the arch

Function

  • Principal blood supply to the plantar aspect of the foot

  • Anastomotic connection between dorsalis pedis and posterior tibial circulations

  • Nutrient supply to interosseous muscles, metatarsal bones, and digital arteries

  • Collateral circulation: Maintains distal perfusion when one of the major arteries (anterior or posterior tibial) is compromised

Clinical Significance

  • Vascular disease: Critical in peripheral arterial occlusive disease and diabetic foot ischemia

  • Trauma: Injury to the arch can lead to ischemia or pseudoaneurysm in the sole

  • Surgical importance: Preservation is vital during plantar incisions or reconstructive procedures

  • Imaging relevance: Evaluated for arterial patency, thrombosis, aneurysm, and pre-surgical vascular mapping

  • Doppler significance: Used to assess plantar perfusion and collateral flow in chronic limb ischemia

MRI Appearance

  • T1-weighted images:

    • Deep plantar arch appears as a tubular low-signal (dark) structure deep to adductor hallucis

    • Surrounding muscle and fat show intermediate and high signal, respectively, aiding identification

    • Absence of flow voids may indicate thrombosis or reduced flow

  • T2-weighted images:

    • Flowing blood causes signal void (dark linear structure)

    • If thrombosed or occluded, lumen appears intermediate-to-bright depending on clot age

    • Adjacent inflammation or edema enhances signal contrast with soft tissue

  • STIR:

    • Normal vessel remains dark due to rapid blood flow

    • Perivascular inflammation, edema, or infection shows hyperintense halo around the vessel

  • Proton Density Fat-Saturated (PD FS):

    • Vessel lumen: low signal (flow void)

    • Wall or thrombus: bright or intermediate signal, useful for detecting arteritis or occlusion

    • Excellent for defining vascular wall integrity and perivascular edema

  • T1 Fat-Sat Post-Contrast:

    • Normal arch: enhancing flow signal within lumen due to active circulation

    • Non-enhancing lumen: indicates occlusion or thrombosis

    • Wall enhancement: seen in vasculitis or post-traumatic vascular injury

CT Appearance

Non-Contrast CT:

  • Arterial arch not well visualized due to similar soft-tissue density

  • May appear as a faint tubular structure deep to the metatarsal bases

  • Calcified atherosclerotic changes in chronic disease can outline the arch

Post-Contrast CT (CT Angiography):

  • Arch clearly visualized as an enhancing curved vessel connecting dorsalis pedis and lateral plantar artery

  • Filling defects: represent thrombus or stenosis

  • Aneurysmal dilation: visible as focal outpouching

  • Three-dimensional CT angiography provides detailed mapping of plantar vasculature and collateral branches

MRI image

deep plantar arterial arch coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI image

deep plantar arterial arch coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI image

deep plantar arterial arch coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00002

CT image

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CT image

deep plantar arterial arch ct axial