BIOMECHANICS CHARACTERISTICS OF THE DIFFERENT WAYS OF FIXING FRACTURES IN KNEE JOINT
Keywords:experimental biomechanics, surgery, traumatology, tibia, fraction, screws, cyclic loads, deformations, hardness, reliability
Purpose. Subject matter of the present paper is to investigate the characteristics of hardness and fixation of fractures with standard and self-tightening screws, fixing the oblique fracture of the proximal epiphyse of tibia in real regimes of external load including the cyclic ones.
Model / methodology / approach. During the experiment the specimen of limbs without pathology of the bone tissue had been used. Fixation of the bone fragments (osteosynthesis) had been performed by the means of standard and self-tightening screws. The tests had been conducted by the way of transmission of load through the distal joint of the epiphysial cartilage of the hip bone and through the injured distal condyle. Load regimes: single static influence and multiple cyclically changing loads, imitating the human weight.Conclusion. During the transmission of the compressing force onto the fragment, the type of the fixing screw greatly influences the deformation of the osteosynthetic systems at all levels of load; permanent residual deformations (mutual shift of fragments) of the systems with self-tightening screws are much more lower if compared to the ones of the systems, employing the standard ones. Employment of the new type of screws significantly increases the fixation stability and generally increases the mechanical durability of the fixation of the oblique fracture of the proximal epiphyse of tibia
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