Document Detail


A minimal parametric model of the femur to describe axial elastic strain in response to loads.
MedLine Citation:
PMID:  8843406     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Evaluating the state of stress/strain for a given geometry and load in femurs can be done both experimentally, measuring strain at a limited number of locations, and theoretically with finite element models. Another approach is to describe the state of strain with a few synthetic indices. For this purpose the reverse elastic problem (i.e. bone parameters are estimated given the strain distribution and loads) needs to be solved as opposed to the finite element direct problem. Such reverse models can be then used: (1) to describe simply the strain distribution by means of few synthetic indices; (2) to explain the state of strain; and (3) to predict the strain distribution under different loading conditions. Various linear models, characterized by two to five bone related parameters, were tested on (1) 12 femurs, (2) a finite element model, and (3) data taken from the literature, for a total of 43 loading cases. Three and four-parameter models were able to fit the experimental strain distributions with mean squared residuals smaller than 5% of the strain range. The consistency of the model was proved by the repeatability of the parameters estimate for identical femurs. Furthermore, the bone-related coefficients were able to detect the stiffening effect of the implantation of an uncemented stem. Finally, the model can be used for predictive purposes if the parameter estimates are used with different loading conditions.
Authors:
L Cristofolini; A Cappello; B P McNamara; M Viceconti
Related Documents :
14980406 - Application of an interface failure model to predict fatigue crack growth in an implant...
16438226 - Simulated bioprosthetic heart valve deformation under quasi-static loading.
17669436 - An improved model of heat transfer through penguin feathers and down.
9338886 - Computer prediction of adaptive bone remodelling around noncemented femoral prostheses:...
21205336 - Will optimality theory colonize all of higher cognition?
10089316 - Automated mad and mir structure solution.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medical engineering & physics     Volume:  18     ISSN:  1350-4533     ISO Abbreviation:  Med Eng Phys     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1997-01-09     Completed Date:  1997-01-09     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9422753     Medline TA:  Med Eng Phys     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  502-14     Citation Subset:  IM    
Affiliation:
Department of Electronics, Informatics and Systems, Engineering Faculty, University of Bologna, Italy.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Biomechanics
Biomedical Engineering
Biometry
Elasticity
Femur / anatomy & histology*,  physiology*,  surgery
Humans
Linear Models
Models, Anatomic
Models, Biological*
Prostheses and Implants
Reproducibility of Results
Stress, Mechanical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  A new in vitro measurement technique for small three-dimensional joint motion and its application to...
Next Document:  The development of the Port-a-Bidet: a portable bidet for people with minimal hand function.