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Dorsal metatarsal ligaments

The dorsal metatarsal ligaments are a series of strong, flat fibrous bands that connect the adjacent dorsal aspects of the metatarsal bones in the forefoot. They contribute to the stability of the metatarsal arches and help maintain proper alignment during movement and weight bearing.

These ligaments are thinner and less robust than the plantar metatarsal ligaments but play a crucial role in stabilizing the dorsal aspect of the metatarsal heads and bases. They work together with the interosseous ligaments to restrict excessive spreading or displacement of the metatarsals during walking, running, and load transfer through the forefoot.

Synonyms

  • Dorsal intermetatarsal ligaments

  • Dorsal transverse metatarsal ligaments

Origin, Course, and Insertion

  • Origin: Emerge from the dorsal surfaces of the metatarsal bones near their bases

  • Course: Run transversely across the dorsal aspect of the foot, connecting adjacent metatarsals

  • Insertion: Attach to the dorsal surfaces of neighboring metatarsal bones, typically near the dorsal interosseous spaces

These fibrous bands are continuous with the capsules of the tarsometatarsal and intermetatarsal joints, forming part of the dorsal reinforcement of the foot’s joint network.

Relations

  • Superiorly: Dorsal tendons of the extensor digitorum longus and extensor hallucis brevis

  • Inferiorly: Interosseous muscles and intermetatarsal ligaments

  • Medially: Dorsal neurovascular bundles and extensor hallucis tendons

  • Laterally: Dorsal digital tendons and superficial fascia of the dorsum of the foot

Nerve Supply

  • Deep fibular (peroneal) nerve branches supplying the dorsal interosseous spaces and adjacent joint capsules

Function

  • Stabilization: Maintains alignment of metatarsal bones and prevents excessive splaying

  • Support: Reinforces the dorsal aspect of tarsometatarsal and intermetatarsal joints

  • Load transfer: Assists in evenly distributing pressure across the metatarsal heads during gait

  • Joint integrity: Works with plantar and interosseous ligaments to stabilize the forefoot

  • Protection: Provides dorsal reinforcement against hyperextension or dislocation of metatarsals

Clinical Significance

  • Sprain or tear: May result from direct trauma or hyperextension injuries of the midfoot

  • Lisfranc injuries: Often associated with combined dorsal and interosseous ligament disruption

  • Degeneration: Chronic strain may cause ligamentous laxity, leading to forefoot instability

  • Pain syndromes: Contribute to dorsal midfoot pain and metatarsalgia when inflamed or stretched

  • Imaging relevance: MRI and CT crucial for detecting subtle ligament injuries, especially in Lisfranc joint evaluation

MRI Appearance

  • T1-weighted images:

    • Normal ligaments: low signal intensity (dark linear bands) connecting metatarsal bones

    • Edematous or torn ligaments: intermediate-to-high signal intensity, with loss of sharp definition

    • Adjacent soft tissues appear intermediate, with surrounding fat bright on T1

  • T2-weighted images:

    • Normal: low signal, slightly darker than on T1

    • Ligament sprains: show focal or diffuse hyperintense signal due to edema or partial tear

    • Complete tears: discontinuity of low-signal fibers replaced by high-signal fluid intensity

    • Bone marrow edema in adjacent metatarsals may appear as bright foci

  • STIR (Short Tau Inversion Recovery):

    • Normal ligaments: dark, sharply defined

    • Pathology: bright hyperintense signal along ligament course, indicating inflammation, edema, or tear

    • Excellent for detecting subtle soft-tissue injury

  • Proton Density Fat-Saturated (PD FS):

    • Normal: thin, dark low-signal bands between metatarsal bases and heads

    • Pathology: linear bright hyperintensity with fiber disruption in partial or complete tears

    • Periligamentous fluid and edema well demonstrated

  • T1 Fat-Sat Post-Contrast:

    • Normal ligaments: no enhancement

    • Inflamed ligaments or synovitis: contrast enhancement of ligament margins and adjacent soft tissue

    • Post-traumatic or chronic strain: mild enhancement due to granulation tissue

CT Appearance

Non-Contrast CT:

  • Ligaments appear as thin soft-tissue densities bridging the dorsal surfaces of the metatarsals

  • Indirect findings: joint space widening, subtle subluxation, or cortical irregularity in trauma

  • Chronic changes: calcification or ossification in degenerative or post-traumatic cases

Post-Contrast CT (standard):

  • Ligaments may show mild enhancement in cases of inflammation or post-surgical scarring

  • Useful for assessing joint alignment, subluxation, and bone avulsion fragments related to ligament injury

MRI images

Dorsal metatarsal ligaments coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI images

Dorsal metatarsal ligaments coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI images

Dorsal metatarsal ligaments coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00002

MRI images

Dorsal metatarsal ligaments coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00003

MRI images

Dorsal metatarsal ligaments coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00004