Modal frequency and shape curvature as a measure of implant fixation: A computer study on the acetabular cup
| Autor: | Steven Leuridan, Kathleen Denis, Wim Desmet, Lukas Capek, Leonard Pastrav, Petr Henyš, Michiel Mulier, Quentin Goossens, Jos Vander Sloten |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Finite element method
Frequency response Materials science Arthroplasty Replacement Hip Modal analysis Finite Element Analysis 0206 medical engineering Biomedical Engineering Biophysics 02 engineering and technology Curvature 03 medical and health sciences Fixation (surgical) 0302 clinical medicine Initial fixation Bone-Implant Interface medicine Modal shapes 030222 orthopedics Damage index Stiffness Acetabulum Initial stability 020601 biomedical engineering Modal Acetabular cup Hip Prosthesis sense organs medicine.symptom Biomedical engineering |
| Zdroj: | Medical Engineering & Physics. 60:30-38 |
| ISSN: | 1350-4533 |
| DOI: | 10.1016/j.medengphy.2018.07.003 |
| Popis: | Modal parameters are often investigated in order to assess the initial fixation of an implant. Most of studies are focused on the natural frequencies and frequency response function. Usually the femoral stem is tested although the acetabular cup fixation is important as well. The results of implant stability assessment are inconsistent and seem to suggest that frequency as a stability indicator is not sufficiently sensitive. In this study the sensitivity of the modal properties to changes in the bone-implant interface was investigated with the help of the finite element method (FEM). A novel fixation index based on modal shape curvature was investigated as a potential measure of the implant fixation. Modal frequencies are sensitive to interface changes in some manner, but suffer from insensitivity to local changes at bone-implant interface. The sensitivity up to 44% of natural frequencies to stiffness change due insertion steps was observed. The tested damage indicators are able to detect localized small changes in peripheral stiffness (5% stiffness reduction) with 95% confidence under the noise up to 1%. The modal shapes and their curvatures have a great potential to be a robust fixation indicator. ispartof: MEDICAL ENGINEERING & PHYSICS vol:60 pages:30-38 ispartof: location:England status: published |
| Databáze: | OpenAIRE |
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