Lunotriquetral Instability

Description: The first description of lunotriquetral instability was by Reagan, Linscheid, and Dobyns in their 1984 paper, Lunotriquetral Sprains. They classified triquetral injuries into sprains and dissociations. Sprains were defind as injuries that did not cause a displacement of the bones. Dissociations were a rupture of the lunotriquetral ligament. They built on the concepts established in the American literature by Dobyns and Linscheid, in their classic paper, Traumatic Instability of the Wrist. This paper noted that the proximal row was an intercalated segment, and that its position depended on the influence of the scaphoid causing proximal row flexion with radial deviation, and the triquetrum causing proximal row extension with ulnar deviation.
David M. Lichtman, MD 2000