[Tests of durability characteristics of osteosynthesis of femoral neck fractures by different fixators under static and dynamic loading]. / Ispytaniia prochnostnykh kharakteristik osteosinteza perelomov sheiki bedra raznymi fiksatorami pri staticheskikh i dinamicheskikh nagruzkakh.

Test bench experiments on the models of femoral neck bone fractures with the use of various kinds of latches has been carried out for evaluation of durability characteristics of the osteosynthesis, using universal test machine "Zwick-1464". 40 preparations of proximal-diaphysis parts of the femoral bone from 28 females and 12 males (mean age 71 years) were used one day after death. The models of basal, transcervical and subcapital fracture were formed with the angle between its planes and horizontal plane (the angle of Pauel's) 30, 40 and 70 degrees. The models of fractures underwent static and dynamic loads, the results being fixed automatically in graphics. The obtained data have confirmed the dependence of the stability of the osteosynthesis by tested fixators on the size of Pauels' angle: the more was this value the less was the firmness of the junction. Dependence of the firmness of fixation of bone fragments on location of the fracture in femoral neck was noted. The differences of durability characteristics of created constructions in basal, and transcervical fractures of types I and II by Pauels are insignificant. The authors think that the least invasive mode for fixation among tested constructions is osteosynthesis with V-shaped bunch of needles, which produced minimal trauma for bone tissue and created resilient tension in the system of bone fixator (latch), which is especially important in osteoporosis.