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Cuneocuboid Joint

The cuneocuboid joint is a midfoot articulation between the lateral cuneiform and the cuboid bone. It forms part of the transverse tarsal (Chopart) and midtarsal joints, helping to stabilize the lateral longitudinal arch of the foot and allowing adaptation to uneven surfaces.

It is a small, relatively planar synovial joint but contributes significantly to midfoot stability. Injuries are uncommon in isolation but may occur as part of midfoot sprains, Lisfranc injuries, or arthritis.

Joints and Articulations

  • Articulates proximally with lateral cuneiform

  • Articulates distally with cuboid bone

  • Part of the transverse tarsal/midtarsal complex, functionally linked with talonavicular joint

Ligament Attachments

  • Dorsal cuneocuboid ligament: Connects dorsal aspects of lateral cuneiform and cuboid

  • Plantar cuneocuboid ligament: Supports joint from below, stabilizing arch

  • Interosseous ligament: Strong fibrous connection within joint capsule, restricting abnormal movement

  • Contributions: Supported indirectly by long and short plantar ligaments

Tendon and Muscle Relations

  • Dorsal surface: Extensor digitorum longus and peroneus tertius pass nearby

  • Plantar surface: Tibialis posterior tendon inserts partly on cuboid and cuneiforms, supporting joint

  • Lateral to joint: Peroneus longus tendon runs in groove of cuboid

Function

  • Arch support: Maintains stability of lateral longitudinal arch

  • Load transmission: Transfers forces between midfoot and forefoot

  • Adaptability: Allows limited gliding movement, aiding foot flexibility

  • Stabilization: Contributes to Chopart joint function, resisting excessive inversion/eversion

Clinical Significance

  • Injuries: Rare in isolation; may occur in high-energy trauma or midfoot sprains

  • Degeneration: Arthritic changes possible, especially in midfoot collapse or post-trauma

  • Lisfranc complex: Pathology often involves adjacent joints, with cuneocuboid joint secondarily affected

  • Symptoms: Localized lateral midfoot pain, swelling, difficulty in weight bearing

  • Imaging role: MRI and CT are key for detecting subtle joint disruption, cartilage loss, or early arthritis

MRI Appearance

  • T1-weighted images:

    • Joint space: low signal line between cuneiform and cuboid

    • Marrow: intermediate-to-high signal depending on fat content

    • Cortical bone: uniform low signal

    • Degeneration: intermediate signal in subchondral bone

  • T2-weighted images:

    • Normal cartilage: thin bright layer

    • Joint effusion: hyperintense fluid signal within joint space

    • Subchondral changes: bright areas suggest edema or cyst formation

    • Cortical bone: remains low signal

  • STIR:

    • Joint space: dark line

    • Pathology: bone marrow edema, effusion, and soft tissue inflammation appear bright hyperintense

  • Proton Density Fat-Saturated (PD FS):

    • Normal: joint margins well-defined, marrow dark

    • Tears/degeneration: bright signal at cartilage or ligament attachments

    • Detects subtle ligament sprains or degenerative changes

MRI Arthrogram Appearance

  • Contrast fills the joint, outlining articular surfaces

  • Cartilage defects: contrast enters fissures or irregularities

  • Helpful in distinguishing true cartilage lesions from intrasubstance signal changes

CT Appearance

Non-Contrast CT:

  • Excellent cortical bone detail

  • Normal joint: narrow, smooth articulation

  • Pathology: subtle fractures, joint space narrowing, sclerosis, and osteophytes visible

  • Small subchondral cysts in degeneration may be detected

CT Arthrogram Appearance

  • Contrast outlines cuneocuboid articulation

  • Linear contrast extension into cartilage defects = chondral or osteochondral injury

  • Useful for detecting early arthritis and subtle joint disruption when MRI contraindicated

CT VRT 3D image

Cuneocuboid joint 3d image

MRI image

Cuneocuboid joint MRI axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI image

Cuneocuboid joint MRI coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

CT image

Cuneocuboid joint sagittal CT cross sectional anatomy radiology image-img-00000-00000