Kopec Mateusz, Brodecki Adam, Szczęsny Grzegorz, Kowalewski Zbigniew L
Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02106 Warsaw, Poland.
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK.
Materials (Basel). 2021 Apr 25;14(9):2209. doi: 10.3390/ma14092209.
In this paper, fracture behavior of four types of implants with different geometries (pure titanium locking plate, pure titanium femoral implant, Ti-6Al-4V titanium alloy pelvic implant, X2CrNiMo18 14-3 steel femoral implant) was studied in detail. Each implant fractured in the human body. The scanning electron microscopy (SEM) was used to determine the potential cause of implants fracture. It was found that the implants fracture mainly occurred in consequence of mechanical overloads resulting from repetitive, prohibited excessive limb loads or singular, un-intendent, secondary injures. Among many possible loading types, the implants were subjected to an excessive fatigue loads with additional interactions caused by screws that were mounted in their threaded holes. The results of this work enable to conclude that the design of orthopedic implants is not fully sufficient to transduce mechanical loads acting over them due to an increasing weight of treated patients and much higher their physical activity.
本文详细研究了四种不同几何形状的植入物（纯钛锁定钢板、纯钛股骨植入物、Ti-6Al-4V钛合金骨盆植入物、X2CrNiMo18 14-3钢股骨植入物）的断裂行为。每种植入物均在人体中发生断裂。使用扫描电子显微镜（SEM）来确定植入物断裂的潜在原因。研究发现，植入物断裂主要是由于重复性、禁止的过度肢体负荷或单一、意外的二次损伤导致的机械过载所致。在众多可能的加载类型中，植入物承受了过度的疲劳载荷，且安装在其螺纹孔中的螺钉会产生额外的相互作用。这项工作的结果表明，由于接受治疗患者体重增加以及身体活动量大幅提高，骨科植入物的设计不足以充分传导作用于其上的机械载荷。
