- See:
-
Kinematics
-
Dynamic Instability
-
Ligaments of the Wrist
-
Perilunate Dislocations
- Instability Patterns:
- ulnar translocation: carpus shifts ulnarward (frequently seen in rheumatoid wrist);
- dorsal intercalated segment instability;
- present when lunate has rotated into dorsiflexion, as seen on
lateral x-rays;
- capitate displaces dorsal to long axis of radius, producing zigzag radiolunatocapitate alignment that is called
DISI;
- volar intercalated segment instability characterized by palmar flexion of lunate;
- non dissociative carpal instability:
-
capitolunate instability
-
mid-carpal instability;
- dissociative instability: refers to instability between individual carpi of the proximal row;
-
scapholunate instability:
-
lunotriquetral dissociation:
Palmar midcarpal instability: results of surgical reconstruction.
Mechanism of Carpal Injuries.
Mayfield, JK.
CORR. 149: 45-54. 1980.
Carpal Dislocations: pathomechanics and progressive perilunar instability.
Mayfield, JK, Johnson RP, and Kilcoyne, RK.
J. Hand Surg. 5: 226-241, 1980.
Carpal Instability Non-Dissociative.
TW Wright, JH Dobyns, RL Linscheid, W Macksound, and J. Siegert.
J. Hand Surg. 19-B, 1994. p 1-11.
Ulnar midcarpal instability - Clinical and laboratory analysis.
DM Lichtman, JR Schneider, AR Swafford, and GR Mack.
Hand Surgery. vol 6. No 5. Sep1981.
