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Navicular bone

The navicular bone is a boat-shaped tarsal bone located on the medial side of the midfoot. It forms a critical link between the talus posteriorly and the three cuneiform bones anteriorly, playing a central role in maintaining the medial longitudinal arch of the foot.

It serves as a keystone structure in the midfoot, transmitting forces between the hindfoot and forefoot. The tuberosity of the navicular, located medially, provides the insertion for the tibialis posterior tendon, a key dynamic stabilizer of the arch.

Injury to or dysfunction of the navicular—whether by trauma, stress fracture, or avascular necrosis—can significantly impair foot biomechanics and weight distribution.

Synonyms

  • Os naviculare pedis

  • Scaphoid bone of the foot

Location and Articulations

  • Location: Medial aspect of the midfoot, between the talar head and the cuneiform bones

  • Posterior articulation: Head of the talus (talonavicular joint)

  • Anterior articulations: Medial, intermediate, and lateral cuneiforms

  • Lateral articulation: Occasionally with the cuboid bone via a small facet

Surfaces and Features

  • Dorsal surface: Convex and rough for ligamentous attachments

  • Plantar surface: Concave and smooth, forming part of the talonavicular joint capsule

  • Medial surface: Prominent tuberosity for insertion of tibialis posterior tendon

  • Lateral surface: Sometimes bears a facet for articulation with the cuboid

  • Posterior surface: Concave for articulation with the talar head

  • Anterior surface: Divided into three facets for the cuneiforms

Attachments

  • Tibialis posterior tendon: Inserts onto the navicular tuberosity and often sends slips to adjacent cuneiforms and metatarsals

  • Ligamentous attachments:

    • Dorsal talonavicular ligament

    • Plantar calcaneonavicular (spring) ligament

    • Medial talonavicular (capsular) ligament

    • Bifurcate ligament (occasionally to lateral aspect)

Relations

  • Superiorly: Dorsalis pedis artery and deep peroneal nerve on dorsum

  • Inferiorly: Plantar fascia and spring ligament

  • Medially: Tibialis posterior tendon and navicular tuberosity (palpable landmark)

  • Laterally: Cuboid and lateral cuneiform (when present facet articulation)

  • Posteriorly: Talus head

  • Anteriorly: Cuneiform bones

Arterial Supply

  • Dorsalis pedis artery (dorsal branch)

  • Medial plantar artery (plantar branch)

  • Arcuate and lateral tarsal arteries provide anastomotic contributions

  • Blood supply may be tenuous, especially in the central zone — predisposing to avascular necrosis (Köhler’s disease)

Venous Drainage

  • Drains into dorsal venous arch and medial plantar veins, which continue to the posterior tibial vein

Function

  • Structural support: Acts as the keystone of the medial longitudinal arch

  • Force transmission: Transfers load between hindfoot (talus) and forefoot (cuneiforms/metatarsals)

  • Joint mobility: Permits limited gliding at the talonavicular and cuneonavicular joints

  • Dynamic stabilization: Assists in foot inversion and plantarflexion through tibialis posterior tendon

Clinical Significance

  • Fractures: Acute (traumatic) or stress fractures common in athletes and military recruits

  • Avascular necrosis: Central portion vulnerable to ischemic necrosis (Köhler’s disease in children, Müller-Weiss syndrome in adults)

  • Accessory navicular: Common anatomical variant; may cause pain or tibialis posterior tendinopathy

  • Dislocations: Rare, but possible in severe midfoot trauma

  • Imaging role: MRI and CT crucial for evaluating stress injury, necrosis, and tarsal coalitions

MRI Appearance

  • T1-weighted images:

    • Normal marrow: bright signal (fat-rich cancellous bone)

    • Cortex: low signal intensity (dark rim)

    • Fracture or necrosis: focal or diffuse low signal replacing normal marrow fat

    • Tendon insertions: dark fibrous attachments on medial tuberosity

  • T2-weighted images:

    • Normal marrow: bright signal (less intense than surrounding fat but hyperintense compared to muscle)

    • Cortex: dark

    • Bone edema or stress injury: hyperintense signal replacing marrow brightness

    • Cortical breaks: seen as bright lines interrupting dark cortex

  • STIR (Short Tau Inversion Recovery):

    • Normal marrow: dark signal

    • Edema, contusion, or fracture: bright hyperintense signal

    • Helpful in early detection of stress fractures or osteonecrosis

  • Proton Density Fat-Saturated (PD FS):

    • Normal marrow: dark (suppressed fat signal)

    • Pathology: bright signal in marrow or cortical region indicating bone bruise, infection, or fracture

    • Useful for differentiating bone edema vs. sclerosis

  • T1 Fat-Sat Post-Contrast:

    • Normal: minimal homogeneous enhancement

    • Inflammation, infection, or osteonecrosis: heterogeneous or peripheral enhancement

    • Chronic necrosis: minimal or absent enhancement in necrotic zones

CT Appearance

Non-Contrast CT:

  • Shows dense cortical margins and trabecular pattern

  • Useful for identifying fractures, sclerosis, fragmentation, and accessory ossicles

  • Stress fractures appear as sclerotic bands or fine cortical breaks

  • Avascular necrosis: shows sclerosis, collapse, and fragmentation of central portion

Post-Contrast CT (standard):

  • Provides limited added value for bone itself

  • May show enhancement in inflammatory or infectious lesions

  • Excellent for evaluating bony architecture and cortical integrity

CT VRT 3D image

Navicular bone 3d vrt image

MRI image

Navicular bone axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI image

Navicular bone coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI image

Navicular bone sag cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

CT image

Navicular bone ct axial image

X ray image

Navicular bone