Mathematical and biomechanical substantiation of buttress-thread half-pin using in the devices for transosseous external osteosynthesis

For the purpose of substantiation of the advantages of use of the half-pin fixators with buttress thread in the devices for transosseous external osteosynthesis we have made a mathematical analysis of the thread types in the half-pins which are most often used in devices for external fixation and have proposed an original half-pin osteofixator of our own design as a prototype. Using a special loading-and-measurement system the radial and axial strength of attaching the half-pins of Fourdiuck' s design, that of CITO and SKID as well as that of our own design was studied in bone metaphyses and diaphyses. The analysis of the results obtained allows to affirm statistically reliable superiority of the half-pin of our own design in the sense of the radial and axial strength of its attaching in comparison with the half-pins mentioned.