Finite-Elemente-Untersuchung zur Impingement-bedingten Schädigung von Implantaten für den Hüftgelenkersatz
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Kurzfassung
Nach künstlichem Hüftgelenkersatz kann Impingement zwischen Endoprothesenhals und Pfanneneinsatz zu Luxation und Implantatschädigung führen. Mithilfe eines Finite-Elemente-Modells wur- den bei unterschiedlichen Implantatpositionen Bewegungen im künstlichen Gelenk simuliert und das Impingement- und Luxationsverhalten analysiert. Die Spannungsuntersuchungen ergaben bei Impingement und während der Subluxation Druckspannungen weit oberhalb der Fließgrenze von UHMW-Polyethylen, wodurch die Impingement-bedingte Schädigung von Pfanneneinsätzen bestätigt wurde. In der vorliegenden Arbeit wird ein neues Implantatdesign vorgestellt, welches wesentlich zur Vermeidung von Impingement-bedingtem Implantatversagen beitragen kann.
Abstract
After total hip replacement, impingement of the prosthesis neck on the rim of the cup can cause both joint dislocation and damage to implant components. Using the Finite-Element-Method, dislocation-prone manoeuvres were simulated at different implant positions to analyse the impingement and dislocation characteristics. Stress analysis showed stresses well above the yield strength of UHMW-Polyethylene during impingement and subluxation, which endorsed impingement-related failures of acetabular liners. A new liner design with the potential to prevent impingement-related failures is presented in the present work.
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© 2007, Carl Hanser Verlag, München
Articles in the same Issue
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- DGZfP-Mitteilungen
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- Fachbeiträge/Technical Contributions
- Recent Advances in Automated Ultrasonic Inspection of Magnox Power Stations
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- Finite-Elemente-Untersuchung zur Impingement-bedingten Schädigung von Implantaten für den Hüftgelenkersatz
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- Vorschau/Preview
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Articles in the same Issue
- Inhalt/Contents
- Inhalt
- DGZfP-Mitteilungen
- DGZfP-Mitteilungen
- Fachbeiträge/Technical Contributions
- Recent Advances in Automated Ultrasonic Inspection of Magnox Power Stations
- Effect of Stress on Ultrasonic Response in Detection and Sizing of Cracks
- Reibverhalten von Werkstoffen für Mikrotiefziehwerkzeuge
- Numerical Computer-Simulation of Fields and Waves in Nondestructive Testing
- Pitting Liability of Thermally Oxidised Austenitic Steel
- Finite-Elemente-Untersuchung zur Impingement-bedingten Schädigung von Implantaten für den Hüftgelenkersatz
- Nano-bio-layers on Ti6Al4V Alloys Using Electrophoretic Deposition (EPD) for Orthopaedic Applications
- Vorschau/Preview
- Vorschau