RISK FACTORS OF FRACTURE NONUNION IN POLYTRAUMA

Aim. To carry out literature analysis devoted to pathological mechanisms of delayed union and nonunion of limb fractures and the influence of various osteosynthesis strategies on bone healing in polytrauma. The risk of bone fractures nonunion in polytrauma increases with high-energy complex comminuted and open fractures with severe injuries of soft tissues and bones, bruised lung, shock and severe massive blood loss. The development of a systemic inflammatory response affects local immune responses in the fracture zone to the early inflammatory phase of bone healing and disrupts subsequent osteogenesis and angiogenesis processes. Early stable-functional osteosynthesis using minimally invasive techniques creates optimal conditions for bone healing. When following the tactics of the stepwise treatment of Damage Control Orthopedics, the risk of infectious complications and fracture nonunion increases with the duration of treatment in the apparatus of external fixation. Conclusion. In polytrauma a violation of consolidation of bone fractures of the extremities occurs more often than in isolated trauma. Risk factors of fracture nonunion in polytrauma are the severity of bone and soft tissue damage, shock, acute blood loss and systemic inflammatory response, as well as unjustified delay in the final stable fixation of long bones fragments or using traumatic methods of their early osteosynthesis without taking into account the severity of the condition of the injured.