Functionally stable internal fixation is of particular relevance to maxillo facial surgery, because it obviates the discomforts and inconveniences of intermaxillary fixation. Given the biomechanics and biophysics of the skeletal system, the true im mobilization of bone can be achieved only through highly technical means. Willenegger speaks of an "advanced school" of bone surgery which, when fully realized, will enable excellent results to be achieved even in the most difficult fractures. To accomplish this goal, ongoing refinements are needed in surgical methods and technology. Advancing the...

During their 20 years of activity members of the Associa tion for the Study of Internal Fixation (AO - ASIF) have made authoritative contributions to the development of internal and external fixation. The close collaboration of surgeons, basic researchers, metallurgists, engineers and the establishment of clinical documentation has made it possible to achieve a solid scientific basis for internal fixa tion. Clear definitions for the standardization of different types of osteosynthesis were possible: interfragmentary compression, splintage and buttressing as well as combina tions of these...