Ulnar-sided perilunate instability: an anatomic and biomechanic study.
A staging system for ulnar-sided perilunate instability is presented based on a series of cadaver dissections and load studies. Stage I: partial or complete disruption of the lunotriquetral interosseous ligament, without clinical and/or radiographic evidence of dynamic or static volar intercalated segment instability deformity; stage II: complete disruption of the lunotriquetral interosseous ligament and disruption of the palmar lunotriquetral ligament, with clinical and/or radiographic evidence of dynamic volar intercalated segment instability deformity; and stage III: complete disruption of the lunotriquetral interosseous and the palmar lunotriquetral ligaments, attenuation or disruption of the dorsal radiocarpal ligament, with clinical and/or radiographic evidence of static volar intercalated segment instability deformity.
Viegas
S F
SF
Division of Orthopaedic Surgery, University of Texas Medical Branch, Galveston 77551.
Patterson
R M
RM
Peterson
P D
PD
Pogue
D J
DJ
Jenkins
D K
DK
Sweo
T D
TD
Hokanson
J A
JA
D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology*; D008023:Ligaments, Articular / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014457:Ulna; D014955:Wrist Joint / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology*