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Interosseous intercuneiform ligaments

The interosseous intercuneiform ligaments are strong, short fibrous bands that connect the adjacent non-articular surfaces of the medial, intermediate, and lateral cuneiform bones in the midfoot. They form part of the intercuneiform joint complex, contributing significantly to the stability and integrity of the transverse arch of the midfoot.

These ligaments are essential components of the midfoot stabilization system, linking the tarsal bones together and acting as deep stabilizers beneath the dorsal intercuneiform ligaments. They resist separation and shearing between the cuneiform bones during weight-bearing and locomotion.

Synonyms

  • Deep intercuneiform ligaments

  • Interosseous cuneiform ligaments

  • Intercuneiform tarsal ligaments

Location and Attachments

  • Medial interosseous intercuneiform ligament: Connects the medial and intermediate cuneiforms

  • Lateral interosseous intercuneiform ligament: Connects the intermediate and lateral cuneiforms

  • These ligaments occupy the interosseous spaces between adjacent cuneiforms, lying deep to the dorsal intercuneiform ligaments

  • Fibers are short and robust, oriented transversely across the bones’ non-articular rough areas

Relations

  • Dorsally: Dorsal intercuneiform ligaments and extensor tendons of the foot

  • Plantar side: Plantar intercuneiform ligaments and the tendons of the tibialis posterior and fibularis longus muscles

  • Medially: Medial cuneiform articulations (naviculocuneiform joint)

  • Laterally: Intermediate and lateral cuneiform articulations connecting to the cuboid

Function

  • Joint stability: Prevent excessive motion between cuneiform bones

  • Load distribution: Transmit and balance forces across the tarsal arch during gait

  • Arch maintenance: Support the transverse and medial longitudinal arches of the foot

  • Resistance to separation: Prevent diastasis of the cuneiforms during weight-bearing

  • Structural integration: Work in concert with dorsal and plantar intercuneiform ligaments for cohesive midfoot integrity

Clinical Significance

  • Injury association: Often involved in Lisfranc injuries or high-energy midfoot trauma

  • Tears or sprains: Lead to instability of the intercuneiform joint, often associated with adjacent dorsal ligament injury

  • Chronic degeneration: May occur in midfoot arthritis or repeated mechanical overload

  • Symptoms: Midfoot pain, swelling, tenderness between cuneiforms, instability on weight-bearing

  • Imaging importance: Assessment essential in midfoot instability, trauma, and arch collapse syndromes

MRI Appearance

  • T1-weighted images:

    • Ligaments normally appear as thin, low-signal (dark) bands connecting cuneiform bones

    • Adjacent marrow and soft tissue: intermediate to bright fat signal

    • Partial tears show focal discontinuity or faint hyperintensity within the ligament substance

  • T2-weighted images:

    • Normal ligament: low signal structure

    • Acute injury: hyperintense signal or disruption between cuneiform margins

    • Surrounding marrow edema in the cuneiforms appears as bright signal changes

  • STIR:

    • Normal ligaments remain dark

    • Sprains, tears, or inflammation show bright hyperintense signal extending into periligamentous soft tissue

    • Helps visualize subtle edema around the cuneiform articulations

  • Proton Density Fat-Saturated (PD FS):

    • Normal: uniform low signal fibrous band

    • Partial tears: linear bright hyperintense signal through ligament fibers

    • Complete tear: full discontinuity with fluid gap between bones

    • Best for detecting small ligament disruptions in midfoot trauma

  • T1 Fat-Sat Post-Contrast:

    • Normal ligaments: minimal enhancement

    • Inflamed or scarred ligaments: show peripheral or diffuse enhancement

    • Chronic degeneration: heterogeneous enhancement with periligamentous fibrosis

CT Appearance

Non-Contrast CT:

  • Ligaments not directly visible, but may appear as fine soft-tissue densities between cuneiforms

  • Indirect signs of injury: joint space widening, subtle diastasis, or cortical irregularity between cuneiforms

  • Chronic injury: sclerosis or osteophyte formation at the intercuneiform joint margins

Post-Contrast CT (standard):

  • Ligaments enhance slightly due to adjacent synovial structures

  • Helpful in assessing bony avulsions or fracture fragments at ligament attachment sites

MRI images

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

MRI images

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

MRI images

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