Abstract
After femoral shaft fractures, metal plates can be implanted to help its recovery. However, the main problem is that a bone fracture plate could crack or fail in the process of recovery, which cause a secondary damage to the patient. The stress concentration caused by the screw layout of the implanted plate is one of the main reasons for the fracture or failure. Since different screw layout solutions lead to different features of stress concentration, taking the femoral straight Ti alloy metal plate as the object, this research employed the optimization theory and the finite element analysis method to optimize the screw layout. Finally the optimal solution is obtained, which can improve fatigue strength of the fixation system and reduce the failure probability of the system, avoiding the secondary damage to the patient.
Highlights
One of the most common fractures is comminuted fracture of femoral shaft supported the main force of human lower body and difficult to recover
Clinical study data suggests that the failures of bone plate are usually divided into three categories [1]: Fracture of plates: Local stress concentration of plate can lead to fatigue fracture, of which most occurs in compression screw holes as Fig. 1(a)
Through the mechanical model of implanted plates, this paper aims to analyze the mechanical properties of metal plates to obtain the optimal screws layout. 8-hole femur straight plate is chosen and four plans will be chosen based on existed screw layout principles [2] and medical theory
Summary
One of the most common fractures is comminuted fracture of femoral shaft supported the main force of human lower body and difficult to recover. Most femur bone plates are locked, and which will continue to be a small probability of failure after implantation. Clinical study data suggests that the failures of bone plate are usually divided into three categories [1]: Fracture of plates: Local stress concentration of plate can lead to fatigue fracture, of which most occurs in compression screw holes as Fig. 1(a). Remove of locking screw: The mating threaded of screw and plate leads to riveting force. Through the mechanical model of implanted plates, this paper aims to analyze the mechanical properties of metal plates to obtain the optimal screws layout. 8-hole femur straight plate is chosen and four plans will be chosen based on existed screw layout principles [2] and medical theory. Five indicators are selected: the maximum axial displacement of the proximal cross-section; the maximum stress of plate and fracture segment; the maximum stress of screw; and the maximum shear stress of screw
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