[Lunar-triquetral instability].

Luno-triquetral instability dogs not appear to be as rare as one is lead to believe. The clinical features are essentially of progressive discomfort on the medial aspect of the wrist. Plain radiographs are generally of little help, with the diagnosis being made by arthrography with cine-radiography. The authors are reporting a retrospective series of 24 patients which fall into two separate groups: 14 isolated luno-triquetral lesions, 10 associated with a generalized involvement of the proximal carpal row, either as a result of peri lunate dislocation or combined scapho-lunate and luno-triquetral instability without anterior subluxation. The authors have performed 13 luno-triquetral arthrodeses, 6 by pin, 6 by compression screws and one by key graft. For the mixed instabilities the treatment was less specific. The results with a mean follow up of is months have highlighted the problem of non union of the arthrodesis and residual pain various technical aspects of achieving a sound luno-triquetral arthrodesis are discussed.