Henys Petr, Capek Lukas, Fencl Jaroslav, Prochazka Egon
Department of Mechanical Engineering, Technical University of Liberec, Liberec, Czech Republic.
Department of Mechanical Engineering, Technical University of Liberec, Liberec, Czech Republic
Proc Inst Mech Eng H. 2015 Jan;229(1):3-8. doi: 10.1177/0954411914561485.
The clinical practice shows that the loosening of acetabular cups is more frequent than stem loosening. With standard cups, the incidence of dislocation failure is highest in the first year after arthroplasty implantation. The aim of the study was to quantitatively evaluate the implant-bone stability of a cementless acetabular cup prosthesis by using a device based on resonance frequency analysis. The evaluation of this device was done by finite element analysis and in vitro experiments. It was shown that not all the resonance frequencies can be measured by our device. The resonance frequencies vary within the range of 500-3000 Hz. The proposed power spectrum measurement gives the information about the absolute stiffness of the press-fit implant.
临床实践表明，髋臼杯松动比股骨柄松动更为常见。对于标准髋臼杯，关节置换植入术后第一年脱位失败的发生率最高。本研究的目的是通过使用基于共振频率分析的装置对非骨水泥型髋臼杯假体的植入物-骨稳定性进行定量评估。该装置通过有限元分析和体外实验进行评估。结果表明，并非所有的共振频率都能被我们的装置测量到。共振频率在500 - 3000 Hz范围内变化。所提出的功率谱测量给出了压配式植入物绝对刚度的信息。
