Design And Biomechanical Analysis Of Internal Fixation On Superior And Inferior Borders For Pelvic Fractures

Currently, the clinical pelvic fracture fixations still have many aspects of problems, with the universal straight remodeling plate as a usual choice. The internal fixation in the operation process needs the doctor’s on-site bending according to the actual situation of bone fractures of the patients, in order to fit the fracture surfaces to a geometric matching. However, repeated bending on the same plate always leads to greatly operation time extending, which ends up to more exposure of organs and tissues within the pelvis, and increases the probability of infection. Meanwhile, the plate bending is also related to stress fatigues, and the stress intensity usually comes in to a significant reduction. Therefore, the measurements and study of a large number of pelvis were operated, and the concrete geometry parameters needed of the pelvis were obtained; accordingly, different types of pelvises were classified, and a set of internal fixation devices suitable for each type of anatomy of pelvic fracture were designed, which can hopefully replace the existing remodeling steel plate; and according to the sexual differences orientation holes with safe directions on the danger zone of acetabulum were added to the plates, thereby screw penetrating of the fixation of acetabular was limited, to reduce the risk of screw insertions into the hip joint; finally by modeling the different fracture models and the corresponding fixation systems, biomechanical analysis were operated to verify the feasibility and advantage of the biomechanism of the internal fixation. This study provides a new and reliable fixing methods for relevant clinical operations, and at the same time, comparative analysis of various fixation devices were carried out, so that certain guiding opinions related to decisions concerning the choice of the alternative fixation techniques and fixing operation processes were offered.