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Division of Orthopaedics

Orthopaedics at the U of T has a long tradition of developing innovative treatment approaches, performing research of the highest quality, developing new education programs, and providing clinical care of the highest quality possible. We are leaders in the field, and our faculty members play leadership roles nationally, and internationally. Read more »

Division Chairs for Orthopaedics - University of Toronto Orthopaedic Chairs 1976 - Today.
From left to right - Ben Alman (2006-Today), James Waddell (1996-2006), Robert Salter (1976-1986), Allan Gross (1986-1996).

Weiler, Dr. Peter

Weiler, Dr. Peter
840 Coxwell Ave., Suite 304
Fax: 416 441-2246
Email: pjweiler@pathcom.com

Specialty Interest:
General Orthopaedics, Joint Replacement

Tessina D’Santos, Secretary
Tel: 416 441-2245

Research Proposal: Finite Element Analysis of A Newly Designed Cementless Femoral Component

One of the most important features that structural engineers must consider when designing any mechanical component concerns the analysis of 'stress and strain'.

Prosthetic hip implants represent mechanical components that are geometrically complex and are constructed from a variety of different materials. In addition, the geometry of the human femur into which the implant is inserted is also complex and extremely variable. As such, the determination of mechanical forces and deformations of the total joint replacement in-vivo represent a significant challenge to biomedical engineers. In the late 1950's, a new technique was developed for this purpose, known as finite element analysis - FEM.

One of the main benefits of FEM analysis concerns the concept that the component is modelled (or simulated) using a computer representation. Consequently, the effect of subtle design modifications can be simulated and analyzed relatively easily and quickly without the need for constructing elaborate laboratory experiments. The application of a valid, accurate FEM analysis to the situation of an implanted hip prosthesis represents an attractive and practical alternative to other more cumbersome and expensive analysis methods.

In the last two decades, there have been numerous attempts at designing the so-called optimum hip joint prosthesis; one that would last a sufficiently long enough time so as to limit loosening (or failure) and thereby minimize the number of re-operations (or revisions). At the same time, the optimum prosthesis would minimize changes in the patient's host bone so that a revision procedure, if necessary, could be undertaken with relative technical ease and would produce a clinical result of patient satisfaction close to that of the index procedure.
Although there have been literally dozens of design attempts, the so-called optimal total hip prosthesis has yet to be developed. Innumerable designs of hip prostheses have been undertaken, each with specific design features and various geometry's, fabricated from many different materials.

The purpose of this study is to undertake a stress analysis of a newly designed femoral component that has recently been developed for use as an uncemented hip prosthesis. It is the intent of our laboratory to use FEM for the stress analysis aspect of component design.

A dedicated microcomputer and a 3rd party CAD-CAM design / analysis software program have been previously purchased. The computer program has been validated based on several relatively simple models using two dimensional analysis. The current project will deal with extending the scope of the project into a three dimensional, non-linear analysis model of an uninstrumented human femur.

Support for this project was obtained through the Toronto East General Orthopaedic Hospital Research Foundation