Derivation of Mathematical Model for Micromotion and Micro-Displacement at the Bone-Implant Interface Using Spring Analysis
Journal Title: Scholars Journal of Engineering and Technology - Year 2016, Vol 4, Issue 10
Abstract
Abstract:One of the major factors that determine the success of hip replacement is the primary stability which is the function of the micromotion on the bone-implant interface. Failure of hips replacement may arise from excessive motion at the implant-bone interface under the weight bearing loads. Minimizing the micromotion of the cementless prosthetic components is a key requirement for obtaining bone in-growth. If the initial movement is excessive, bone in-growth into the porous surface will not occur. Few experimental studies are available on implant micromotion largely due to difficulty of simulating loads in-vitro and in-vivo. Due to this reason, this research derived a theoretical model that relates the micro-velocity at which the implant moves down in the bone at the implant-bone surface at a specific time, the axial force applied on the head of the implant and the stiffness of the implants and the bones. The implant-bone interface (fibrous tissues) was taken as elastic surface that obeys Hooke’s law using spring analysis. Here, the displacement of the implant equals the micromotion depending on the stiffness of both cortical and trabecular (cancellous) bones. When the implant is axially loaded, due to the elastic modulus of the bone when compared to that of the implant (stainless steel), the deformation of the implant is neglected. That is, Ei >> (EC,ET) where Ei ,EC and ET are the elastic moduli of the implant, cortical part of the bone and the trabecular part of the bone respectively. Keywords:Cortical bone, Micromotion, Micro-displacement, Implant-bone interface, Spring stiffness.
Authors and Affiliations
Gabriel Oladeji Bolarinwa, Sam Nna Omenyi, Chinonso Hubert Achebe
Keywords
Related Articles
- EP ID EP385876
- DOI -
- Views 83
- Downloads 0
Using Vegetation Indices (NDVI, RVI, IPVI, and DVI) to Detect Physical and Chemical Parameters from Landsat-8(OLI) Image when Pixel Mixing Soil,Vegetation, and Water
Remote sensing provides an active and reliable means of collecting the data required, so as to map water quality. Besides providing an overall view, remote sensing can supply structure information about the parameters of...
Use of new management techniques in the Italian Health care System
The Italian healthcare system is operating in a condition of economic crisis; this system must conform its activity to the criteria of efficiency, effectiveness and economy without disregarding the quality of the service...
On The Integral Solutions Of The Binary Quadratic Equation x2=15y2-11t
The binary quadratic Diophantine equation represented by , t odd is analysed for its non-zero distinct integer solutions. Employing the lemma of Brahmagupta, infinitely many integral solutions of the above Pell equatio...
Restraint of Pear Juice Browning through Pre-Treating Material with Microwave
Pear materials were respectively treated with 90, 270, 450, 720, and 900 W microwave power at 30, 60, 90, and 120s, and the effect of microwave pretreatment on the browning of pear juice were investigated. The results sh...
Handling Unstructured Data for Semantic Web – A Natural Language Processing Approach
World Wide Web is a large repository of structured data and un-structured data. Structured data has a well-fixed structure thus is easy to analyze and use with computational machinery. On the other side handling of unstr...