Bengt Mjöberg, M.D., Ph.D.; Steven J. McCabe, M.D., F.R.C.S.


The etiology of Kienböck disease has been a matter of debate for many years. Bonzar et al., in “Kienböck Disease and Negative Ulnar Variance” (80-A: 1154–1157, Aug. 1998), confirmed an association between negative ulnar variance (shortness of the ulna relative to the radius) and Kienböck disease, and they concluded that their findings support the hypothesis proposed by Hultén2 that relative shortness of the ulna may predispose to Kienböck disease. However, because relative shortness of the ulna seemed to be a predisposing rather than a causative factor, they suggested that unknown factors may influence the development and expression of Kienböck disease. Thus, it seems justified …

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