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Os Styloideum

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(Redirected from Os styloideum)

Description

a Sagittal view showing a separate carpal bone fragment along the dorsal area of the 3rd metacarpal base (arrows). b Axial view showing an accessory bone, the os styloideum (arrow) between the capitate (c) and the trapezoid (Tz). This image rules out third metacarpal base fracture as a differential diagnosis[1]

Name

  • Os Styloideum
  • Carpal Boss

General

Radiographic Appearance

  • Seen at the base of the 2nd/3rd metacarpal base
  • May be mistaken for a metacarpal fracture

Clinical Significance

  • Carpal Boss Syndrome

See Also


References

  1. Maquirriain, Javier, and Juan Pablo Ghisi. "Acute os styloideum injury in an elite athlete." Skeletal radiology 35.6 (2006): 394-396.
  2. Karmazyn B, Siddiqui AR. Painful os styloideum in a child. Pediatr Radiol. 2002;32:370–372. doi: 10.1007/s00247-001-0639-6
Created by:
John Kiel on 23 January 2025 19:58:32
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Last edited:
23 January 2025 22:14:35
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