Hamate Body Fracture

Hamate Body Fracture

Kenrick C. Lam

Andrew Coskey

Niki L. Carayannopoulos


  • Pathoanatomy

    • Hamate is a triangular prism-shaped bone in the coronal plane with a large anterior-sided process, the hook of the hamate.

    • Articulates with and bordered by the 4th and 5th metacarpals, pisiform, triquetrum, lunate, and capitate

    • Blood supply

      • Dorsal intercarpal arch—dorsally

      • Branches of the deep palmar arch via retrograde flow—volarly

    • Ligaments

      • Interosseous, dorsal and volar capitohamate ligament

      • Volar and dorsal triquetrohamate ligament

      • Hook of hamate pisiform ligament

      • Three hamatometacarpal ligaments dorsally to the 4th and 5th metacarpals

      • One hamatometacarpal ligament volarly to the 5th metacarpal

    • Extensor carpi ulnaris (ECU) acts as deforming force in fracture or dislocation.

  • Mechanism of injury

    • Direct axial load—closed fist punch

      • Dorsal fracture dislocation of carpometacarpal (CMC) joint1,2,3

      • Coronal dorsal hamate fracture4,5,6,7

    • Blunt force through metacarpal with wrist extended—motorcycle or automobile accident

      • Dorsal fracture dislocation of CMC joint8,9,10,11

    • Direct trauma to the hamate

      • Sagittal split fracture12

      • Nondisplaced with varying comminution13,14

    • Fall on outstretched hand

      • Coronal body (ulnar deviated) or sagittal split (radial deviated) fracture15

    • High-energy injury, crush injury, or perilunate fracture dislocation13,16,17,18,19

      • Transverse fracture

  • Epidemiology

May 7, 2019 | Posted by in ORTHOPEDIC | Comments Off on Hamate Body Fracture
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