The use of temporary hip prosthesis made of orthopedic cement (spacer) in conjunction with antibiotics became a widespread method used for treating prosthetic infections despite the fact that this method makes bone cement (PMMA) more fragile. The necessity to incorporate reinforcement is therefore crucial to strengthen the bone cement. In this study, a validated Finite Element Modelling (FEM) was used to analyze the behavior of spacers. This FEM model uses a non-linear dynamic explicit integration to simulate the mechanical behavior of the spacer under quasi-static loading. In addition to this FEM, Extended Finite Element Method (XFEM) was also used to investigate the fracture behavior of the spacers reinforced with titanium, ceramic and stainless-steel spacer stems. The effect of the material on the performance of the reinforced spacers was also analyzed. The results showed that numerical modelling based on explicit finite element using ABAQUS/Explicit is an effective method to predict the different spacers' mechanical behavior. The simulated crack initiation and propagation were in a good agreement with experimental observations. The FEM models developed in this study can help mechanical designers and engineers to improve the prostheses’ quality and durability.

尽管矫形骨水泥（垫片）使骨水泥（PMMA）更易碎，但使用由骨科水泥（垫片）和抗生素制成的临时髋关节假体已成为治疗假体感染的一种普遍方法。因此，必须加入增强剂对于增强骨水泥至关重要。在这项研究中，经过验证的有限元建模（FEM）用于分析垫片的行为。该有限元模型使用非线性动态显式积分来模拟垫片在准静态载荷下的机械性能。除此有限元法外，还使用扩展有限元方法（XFEM）来研究用钛，陶瓷和不锈钢垫片加强的垫片的断裂性能。还分析了材料对增强垫片性能的影响。结果表明，使用ABAQUS / Explicit的基于显式有限元的数值模型是预测不同隔圈力学性能的有效方法。模拟的裂纹萌生和扩展与实验观察结果非常吻合。这项研究中开发的FEM模型可以帮助机械设计师和工程师提高假体的质量和耐用性。