Development of a new femoral component for patellofemoral prosthesis

A. Castro, P. Flores, A. Completo, J. Simões
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引用次数: 1

Abstract

The purpose for this work was to analyze the structural effects of the implantation of contemporary patellofemoral prosthesis on femur cancellous bone. In fact, studies on the state of strain/stress on patellofemoral arthroplasty are still very limited. The influence of the geometry and rigidity of the bone-implant interface is discussed, applying the Finite Element Method. One of the major reasons for the failure of currently available knee implants is the stress shielding effect. In loading situations, the bone is less requested, so the rate of bone remodeling decreases. The results showed that elastic strain is lower on bone areas close to the studied models of patellofemoral prosthesis, on the period after the implantation. Later on, bone rupture by fatigue may also occur, due to high strain, particularly on the models with fixation pins for the prosthesis. Furthermore, contact analyses showed that stability is best promoted without fixation pins.
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新型髌股假体股骨假体的研制
本研究的目的是分析现代髌骨假体植入对股骨松质骨的结构影响。事实上,关于髌股关节置换术中应变/应力状态的研究仍然非常有限。应用有限元方法,讨论了骨-种植体界面的几何形状和刚度的影响。目前可用的膝关节植入物失败的主要原因之一是应力屏蔽效应。在负荷情况下,对骨骼的需求减少,因此骨骼重塑的速度降低。结果表明,髌骨假体植入后,与所研究模型接近的骨区弹性应变较低。随后,由于高应变,疲劳导致的骨断裂也可能发生,特别是在使用假体固定针的模型上。此外,接触分析表明,在没有固定销的情况下,稳定性最好。
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