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Summary: Affine Transformations and Atlases: Assessing a New
Navigation Tool for Knee Arthroplasty
B. Ma
J. F. Rudan
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R. E. Ellis
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1. School of Computing 2. Mechanical Engineering 3. Surgery
Queen's University at Kingston, Canada
contact: ellis@cs.queensu.ca
Abstract
We propose a new guidance paradigm for computer-assisted orthopædic surgery, based on non-
rigid registration of a patient to a standard atlas model. Such a method would save costs and time
compared to CT-based methods, while being more reliable than current imageless navigation
tools. Here, we consider application of this paradigm to knee arthroplasty.
This work reports laboratory results of assessing the simplest nonrigid registration method,
which is an affine transformation. Results from CT scans of 15 patients show the method is
more repeatable than the standard mechanical guide rods in the frontal plane. The affine trans-
formations also detected a potential difference between osteoarthritic patients and the normal
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