title: Evaluation of acetabular cup initial fixation by using resonance frequency principle.
abstract: 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.
authors: Department of Mechanical Engineering, Technical University of Liberec, Liberec, Czech Republic.
authors: Petr
authors: P
authors: Henys
authors: Department of Mechanical Engineering, Technical University of Liberec, Liberec, Czech Republic lukas.capek@tul.cz.
authors: Lukas
authors: L
authors: Capek
authors: Department of Applied Mechanics, Beznoska Ltd, Kladno, Czech Republic.
authors: Jaroslav
authors: J
authors: Fencl
authors: Department of Orthopaedics, University Hospital in Hradec Kralove, Hradec Kralove, Czech Republic.
authors: Egon
authors: E
authors: Prochazka
mesh_terms: D000077:Acetabulum / Q000502:physiology* / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D055119:Elastic Modulus / Q000502:physiology; D019544:Equipment Failure Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D009991:Oscillometry / Q000379:methods*; D017755:Prosthesis Fitting / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013314:Stress, Mechanical; D014732:Vibration
keywords: Resonance frequency analysis; acetabular cup; finite element analysis; resonance frequency; stability; total hip replacement