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Plantar intercuneiform ligaments

The plantar intercuneiform ligaments are strong fibrous bands located on the plantar aspect of the foot, connecting the adjacent cuneiform bones (medial, intermediate, and lateral). These ligaments contribute significantly to the stability of the transverse arch of the foot and help maintain alignment among the cuneiform bones during weight-bearing and gait.

They form part of the midfoot ligamentous complex, which includes both dorsal and plantar intercuneiform ligaments. The plantar group is thicker, stronger, and reinforced by the tibialis posterior and peroneus longus tendons, playing a crucial role in longitudinal and transverse arch support.

Injury or laxity of these ligaments may result from midfoot trauma, Lisfranc complex injuries, or chronic arch collapse (pes planus).

Synonyms

  • Plantar cuneocuneiform ligaments

  • Plantar interosseous cuneiform ligaments

Attachments

  • Proximal attachment: Plantar surface of the medial cuneiform

  • Distal attachment: Plantar surfaces of the intermediate and lateral cuneiform bones

  • Fibers run obliquely and transversely, blending with the interosseous intercuneiform ligaments deep to them

Relations

  • Superiorly: Interosseous intercuneiform ligaments and intercuneiform joint spaces

  • Inferiorly: Plantar fascia and tendon slips of tibialis posterior and peroneus longus

  • Medially: Medial cuneiform and navicular articulation

  • Laterally: Lateral cuneiform and cuboid articulation

  • Anteriorly: Base of the first and second metatarsals

  • Posteriorly: Navicular bone and its plantar surface

Function

  • Stabilization: Maintains the alignment of the three cuneiform bones

  • Arch support: Reinforces the transverse and longitudinal arches of the foot

  • Load distribution: Helps transfer and dissipate body weight across the midfoot

  • Joint integrity: Prevents excessive motion between the cuneiform bones during gait

  • Synergy: Works with tibialis posterior and peroneus longus to stabilize the midfoot during stance phase

Clinical Significance

  • Injury: May be disrupted in Lisfranc ligament injuries, midfoot dislocations, or severe inversion/eversion sprains

  • Degeneration: Chronic strain can lead to plantar arch collapse and medial foot pain

  • Inflammation: Plantar fasciitis and tarsometatarsal joint arthritis may secondarily involve these ligaments

  • Surgical relevance: Important in midfoot stabilization procedures and reconstructions

  • Imaging role: MRI and CT are vital in assessing ligament integrity, partial tears, or ossification

MRI Appearance

  • T1-weighted images:

    • Normal ligament: low signal (dark) fibrous band between cuneiforms

    • Adjacent fat and muscle show intermediate to bright signal

    • Disruption or tear: irregular high-signal intensity or loss of the normal continuous band

  • T2-weighted images:

    • Normal ligament: low signal, sharply marginated structure

    • Acute injury: hyperintense signal indicating edema or partial tear

    • Chronic changes: thickened or irregular low-signal band with adjacent sclerosis

  • STIR:

    • Normal ligament: dark

    • Injury or inflammation: bright hyperintense signal with surrounding soft-tissue edema

  • Proton Density Fat-Saturated (PD FS):

    • Normal: uniformly dark linear band

    • Partial tear: bright signal within or around the ligament

    • Complete tear: discontinuity with fluid-filled gap between cuneiform bones

    • Excellent for evaluating subtle sprains or chronic attenuation

  • T1 Fat-Sat Post-Contrast:

    • Normal: minimal enhancement

    • Pathology: enhancement along ligament margins due to inflammation or postoperative granulation tissue

CT Appearance

Non-Contrast CT:

  • Ligament not distinctly visualized; appears as a thin soft-tissue density band between cuneiform bones

  • May show widening of intercuneiform space or small avulsion fragments in acute injury

  • Chronic cases: subchondral sclerosis or osteophyte formation along cuneiform margins

Post-Contrast CT (standard):

  • Mild enhancement may outline thickened or inflamed ligamentous tissue

  • Useful in assessing associated joint degeneration, calcification, or ossified scar tissue

MRI image

Plantar intercuneiform ligaments axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI image

Plantar intercuneiform ligaments axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI image

Plantar intercuneiform ligaments axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00002

MRI image

Plantar intercuneiform ligaments coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000