Abstract
The locking compression plates (LCP) are efficient tools in open reduction and internal fixation (ORIF), especially in osteoporotic bones. Two important factors of screw density and screw position can affect the functionality of the bone plate. Several studies have assessed the influence of the screw configurations on the bone-plate stiffness, but the effects of screw positions on the interfragmentary strain, eIF of LCP construct have not been investigated yet. In this study, finite element method was used to investigate the influence of screws number and position on the interfragmentary strain of LCP-femur system for a mid-shaft fracture. Results of this study showed that by insertion of screws closer to the fracture site, eIF decreases by 2nd degree polynomial function versus screw position, but by adding the screws from the ends of the plate, or by moving and placing the screws towards the fracture site, the reduction of eIF will be linear. Results of this study were compared and are in agreement with some studies in the literature, even though their scope was mostly stability of the bone-implant system, whereas our scope was focused on the interfragmentary strain.
Highlights
Femur is the biggest and strongest bone, and one of the main components for load bearing in our body [1]-[3]
Comminuted and segmental fractures of mid-shaft femur can be treated by internal fixation systems, such as orthopedic plates specially when there is extremely narrow medullary canal [4]-[7]
An investigation was made on the impact of screw position on the interfragmentary strain in a Locking compression plates (LCP)-femur construct
Summary
Femur is the biggest and strongest bone, and one of the main components for load bearing in our body [1]-[3]. Mid-shaft fractures of the femur are very common and one of the most prevalent fractures, especially in car accidents [2]. Comminuted and segmental fractures of mid-shaft femur can be treated by internal fixation systems, such as orthopedic plates specially when there is extremely narrow medullary canal [4]-[7]. Locking compression plates (LCP) by taking the advantage of the threaded holes in the plate, is not pressed to the bone, which this can greatly reduce the biological damage [8]. Because of the threaded holes, the bone-plate structure turns into an integrated structure that increases in the resistance of the screws to the pullout force [3]. Direct contact between the bone and plate is not needed, and the gap between the plate and bone results in a better blood supply to the fracture site, and there are no need to plate shaping, based on the geometry of the broken bone, during surgery [3] [8] [9]
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