Angular stability

from Wikipedia, the free encyclopedia

The non-positive connection between two parts is generally referred to as angularly stable , with the contact surfaces of both parts being connected to one another firmly and without movement.

In the field of osteosynthesis , the terms unidirectional-angle-stable and multidirectional-angle-stable exist . The terms go back to Dietmar Wolter , Hamburg.

Both terms describe the angle-stable connection between bone screw and bone plate, whereby the screw position in unidirectional angle-stable plate systems cannot be freely selected, and the angle between screw and plate is usually 90 degrees. In the multidirectional angle-stable plate system, the screw position can be freely selected up to a variation angle of 20 degrees. The operational possibilities are thereby increased significantly.

The patented, multidirectional plate system "tifix", for example, achieves multidirectional angular stability through cold welding between the edge of the screw hole in the bone plate and the screw head of the bone screw, which has a thread. This process is made possible by the different hardness of titanium materials in the plate and screw.

Other systems try e.g. B. by pressure plates o. Ä. That are screwed onto the actual bone plate to fix the screw head in the plate hole, so to make it angle stable.

Web links