Publication

Finite element modelling of micromotion at the bone-implant interface

2015
Student Projects

Abstract

A good implant primary stability is closely associated with long-term success of total hip arthroplasty. Excessive interfacial micromotion around the femoral component after cementless hip replacement is related to aseptic loosening of the stem and affects the primary fixation of the implant. Finite elements (FE) models are able to predict a complete map of interfacial micromotion. However, due to the difficulty to measure implant micromotion directly at the interface, these models lack validation. Recently, a micro-CT based technique was developed to measure interfacial bone-implant micromotion at multiple points around the femoral stem during compression and torsion. In this project, a FE model of interfacial micromotion around a femoral stem will be developed. Compressive and torsional loading will be considered and the results obtained with the FE model will be compared with the available experimental measurements.

Official source

https://infoscience.epfl.ch/entities/publication/33928294-bac8-4dc8-8927-7b894799cbbd

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2015
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/33928294-bac8-4dc8-8927-7b894799cbbd

About this result

Related concepts (32)

Hip replacement

Hip replacement is a surgical procedure in which the hip joint is replaced by a prosthetic implant, that is, a hip prosthesis. Hip replacement surgery can be performed as a total replacement or a hemi (half) replacement. Such joint replacement orthopaedic surgery is generally conducted to relieve arthritis pain or in some hip fractures. A total hip replacement (total hip arthroplasty or THA) consists of replacing both the acetabulum and the femoral head while hemiarthroplasty generally only replaces the femoral head.

Knee replacement

Knee replacement, also known as knee arthroplasty, is a surgical procedure to replace the weight-bearing surfaces of the knee joint to relieve pain and disability, most commonly offered when joint pain is not diminished by conservative sources. It may also be performed for other knee diseases, such as rheumatoid arthritis. In patients with severe deformity from advanced rheumatoid arthritis, trauma, or long-standing osteoarthritis, the surgery may be more complicated and carry higher risk.

Osseointegration

Osseointegration (from Latin osseus "bony" and integrare "to make whole") is the direct structural and functional connection between living bone and the surface of a load-bearing artificial implant ("load-bearing" as defined by Albrektsson et al. in 1981). A more recent definition (by Schroeder et al.) defines osseointegration as "functional ankylosis (bone adherence)", where new bone is laid down directly on the implant surface and the implant exhibits mechanical stability (i.e.

Related publications (3)

Finite element modelling of micromotion at the bone-implant interface

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Subsidence of Modular Fluted Tapered Stems After Femoral Revision Surgery: Risk Factors and a Novel Classification System

FE modeling of micromotion at the bone-implant interface

New Frontiers in Surface and Interface Instrumentation - Spectromicroscopy, Ultrabright Synchrotron-Radiation, Free-Electron Lasers