Tuesday, November 29, 2016

Biomechanics and Pathomechanics of carpal bone instability.

Biomechanics and Pathomechanics



Please click on the image below to enlarge images












































The radial deviation wrist position; position of the scaphoid in closer proximity to the radius



Conversely, the ulnar deviated position pulls the scaphoid away from the radius. 




































Angle is measured between a line drawn along long axis of scaphoid and the short axis of lunate perpendicular to the lunate capitate space.


Scapholunate angle
  • Normal: 30 - 60°
  • Questionably abnormal: 60 - 80°
  • Abnormal: > 80° This indicates instability of the wrist.


quoted from

Louis A. Gilula and Ileana Chesaru

Wrist - Carpal instability
The Radiology Assistant


The numbers are soft, but this is a guide

  • VISI < 30 degrees
  • Normal 30 - 60 degrees
  • DISI > 60 degrees



Normal angle

VISI



Normal angle

DISI

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