Biomechanical substantiation of using intramedullary wires with bioactive coating in treatment of long tubular bone fractures

Purpose. To substantiate biomechanically the increase in long bone osteosynthesis stability, and the possibility of significant reducing the periods of bone fragment consolidation. Materials and Methods. A new technique described for treatment of fractures of the upper and lower limb bones based on performing intramedullary osteosynthesis using wires with bioactive coating of organic hydroxyapatite (HA). The dynamics of bone formation around the implant traced, the biomechanical calculations of osteosynthesis stability demonstrated. Results. The technique allows reducing the periods of shaft fracture consolidation 2-4-fold. Conclusion. The calculations evidence the fact that a traumatologist really may well expect the strength of leg consolidation in a patient in case of early disassembling the Ilizarov fixator for the longitudinal load of 180 kgf and shear load (above 100 kgf). The bending loads with the force close to 39 kgf can result in refracture, that is why further preventive immobilization of the injured segment as orthosis is required; and the orthosis will allow increasing the permissible load of the limb, providing resistance to bending.