[Significance of "healing instability" of the fracture fissure in fracture healing. Absolutely stable osteosynthesis must not be enforced].

The difficulty inherent in operative osteosynthesis is that for every type and localization an optimal biomechanical constellation must be achieved in the fissure, depending on the physiological tasks and functions to be performed by the bone in question. The authors point out the possible sequels of both excessive stabilization and insufficient stabilization. The compression nail developed from the intramedullary Küntscher nail has proved its worth as a so-called "fixateur interne" for the realization of the dynamic lock principle, not least also because the tissue is hardly injured since the long bone is not "drilled open" and also because the bone remains fully integrated as a weight bearer.