| Summary: | 碩士 === 國立臺灣科技大學 === 應用科技研究所 === 107 === Femoral fracture is one of the most common fractures in human body. Locking compression plates have been widely used for the treatment of femoral fractures. Different strategies for femoral fractures have been developed to enhance the mechanical stability of locking plate fixation. Previous studies have found that the number and the position of the screw were the key factors in the stability of the locking plate. However, most studies used a simplified femoral numerical model which cannot truly evaluate the biomechanical results of implant to investigate the influence of screws number and position. In the present study, we developed a finite element (FE) model of lower limb to investigate the biomechanical performance of the various locking plate fixation strategies in femoral fractures during the gait.
A complete lower extremity model in present study included pelvis, femur, tibia and foot. The complete lower limb models, screws and locking plates were created by Solidworks, and then imported into ANSYS 19.2 Workbench. Three periods of the gait cycle were considered including Foot flat, Mid-stance and Heel off phases. In terms of the fixation strategy, the screws were divided into seven types of screws numbers and screw positions. The FE analysis was performed to investigate the influence of the number and position of the screws in three different postures. The results were presented by evaluating the fracture displacement and the maximum stress of locking plate and screw.
Among the FE models in three postures, the results showed that the foot-to-ground model had higher maximum stress of both locking plates and screws, which improved the failure of implants. As the plate working length increased, the maximum stress of both locking plates and screws decreased. The results suggest that applying ten screws could have a better fixation performance. This study could provide useful information for the treatment of distal femoral fracture.
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