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Volar plate (hand)

The volar plate (also called the palmar plate) is a thick fibrocartilaginous structure located on the palmar aspect of the proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints of the fingers. It reinforces the palmar joint capsule and acts as a strong checkrein to prevent hyperextension.

It blends with the fibrous flexor tendon sheath, collateral ligaments, and surrounding soft tissues, forming the stabilizing framework of the finger. The volar plate is essential for maintaining joint stability, guiding flexor tendon motion, and ensuring proper finger biomechanics during gripping and fine motor tasks.

Synonyms

  • Palmar plate

  • Palmar ligament of finger

  • Volar ligament of interphalangeal joint

Location and Structure

  • Position: Palmar side of the PIP and DIP joints

  • Composition: Dense fibrocartilage with collagen bundles oriented longitudinally and transversely

  • Shape: Thick distally, thinner proximally; forms a hinge-like structure

  • Joint involvement:

    • More robust and clinically relevant at the PIP joint

    • Smaller and thinner at the DIP joint

Attachments

  • Proximal attachment: Loosely attached to the palmar base of the proximal phalanx

  • Distal attachment: Firm attachment to the base of the middle phalanx (PIP) or distal phalanx (DIP)

  • Lateral connections: United with proper collateral ligaments and accessory collateral ligaments

  • Flexor tendon sheath: Blends with the A3 (PIP) and A5 (DIP) pulleys

Relations

  • Dorsally: Articular cartilage of phalangeal heads, joint space

  • Palmar: Flexor digitorum superficialis/profundus tendons and digital pulleys

  • Laterally: Collateral and accessory lateral ligaments

  • Distally: Middle or distal phalanx base

  • Proximally: Fibrous joint capsule

Function

  • Prevents hyperextension of PIP and DIP joints

  • Provides stability in gripping and fine motor actions

  • Reinforces the palmar capsule

  • Acts as a gliding surface for flexor tendons

  • Helps distribute joint forces during flexion

Clinical Significance

  • Volar plate injuries: Common in sports due to hyperextension

  • Avulsion fractures: Bony fragment pulled from middle phalanx

  • PIP instability: Results from plate rupture or attenuation

  • Swan-neck deformity: May result from chronic volar plate laxity

  • Imaging importance: Assessed in ligamentous injuries, trauma, and deformity evaluation

MRI Appearance

T1-weighted images:

  • Volar plate appears as low-to-intermediate signal intensity

  • Fibrocartilage structure shows uniform thickness and smooth margins

  • Surrounding fat shows bright signal enhancing delineation

  • Flexor tendons appear as low-signal linear structures dorsal to plate

T2-weighted images:

  • Volar plate is low signal, darker than surrounding soft tissues

  • Joint fluid appears bright, outlining palmar plate margins

  • Clear visualization of plate continuity and thickness

STIR:

  • Normal volar plate shows intermediate-to-dark signal

  • Provides excellent contrast between the plate and bright fat-suppressed background

  • Highlights subtle soft tissue edema if present (though pathology excluded here)

CT Appearance

Non-Contrast CT:

  • Volar plate appears as a soft-tissue density band along palmar aspect of PIP or DIP

  • Best visualized when joint is in slight flexion

  • Fat planes of the finger outline the structure

MRI images

Volar plate hand MRI axial image-img-00000-00000