- See:
Kinematics
Carpal Instability
- Discussion:
- pts w/ dynamic instability can actively subluxate wrist w/ forearm pronated
& wrist in or out of ulnar deviation;
- dynamic forms of
dorsal or
volar intercalated-segment instability are
secondary to loss of support across ulnar half of mid-carpal joint
- Radiographs:
- static radiographs are considered normal, although alignment of radiocarpal
link may have palmar or dorsiflexion bias;
- x-rays should be made w/ pt's forearm & hand
pronated, elevated on
bolster, & placed against x-ray plate, which is held vertically;
- x-ray is directed horizontally across wrist; (
lateral view);
- will accentuate either volar or dorsal intercalated-segment instability,
w/ loss of alignment between capitate & radius;
