MECHANICAL AND CLINICAL CHARACTERISTICS OF THE «ROD – BONE» CONNECTION IN TREATMENT OF GUNSHOT FRACTURES WITH EXTERNAL ROD DEVICES FROM VARIOUS MANUFACTURERS

Objective. To find out the state of bone threading under conditions inserting rods different manufacturers and to establish duration a stable «rod – bone» connection in treatment diaphyseal fractures bones limbs. Methods. An experiment was conducted using tibia calves. Rods used external fixators Biomet (France), Stryker (USA), LLC H B Orto (Ukraine), ORTOPAK (Ukraine) were selected. The shape its contact with surface rod studied at 2‒5X magnification. Devices from specified fix fragments during gunshot 91 patients. stability checked. Results. showed that order obtain appropriate threading, it is necessary first pass through both layers compact diaphysis drill diameter corresponds inner threaded part rod. Without this, coils cortical layer are destroyed or second chipped off, reducing strength fixation. In case screwing into drilled channel bone, quality worse all cases. Under installing cancellous larger number defective turns formed compared one. lowest frequency instability patients found when device (18 %); much more frequent (35– 51 %) devices other manufacturers. incidence unstable almost 4 times greater their location epimetaphysis than diaphysis. Conclusions. For most effective screw prepared depends on technical characteristics localization fusion fragments.