[Posttraumatic avascular necrosis of the scaphoid bone, our arthroplasty modification after dwayer.]

In the introduction the authors present this unit from the viewpoint of its incidence. With regard to its etiology and pathoanatomy its development is compared to the aseptic necrosis of femoral head. A scheme illustrates the basic surgical solutions of this condition. The modified method after Dwayer was performed at the authors' department in three cases since 1995. The authors emphasize the principle not to remove a greater portion of the bone than one quarter of the total size. Discussion deals with the Preiser disease which represents an idiopathic aseptic necrosis of the scaphoid bone. Apart from the outcomes of standard surgical methods the authors describe also their experience with new, non-traditional techniques of the treatment of posttraumatic aseptic necrosis of the proximal part of the scaphoid bone. Key words: Aseptic necrosis of the proximal fragment of the scaphoid bone, resection arthroplasty.