US Patent 7,625,409
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US) ; Deland, Jonathan T. (New York, NY, US) ; Burstein, Albert H. (Sarasota, FL, US)
A fixed-bearing ankle prosthesis may include tibial and talar components whose articulating surfaces directly contact one another. The tibial component defines medial and lateral concave condylar facets separated by a convex central portion. The talar component includes medial and lateral convex condyles separated by a concave central portion. The condyles each have a single radius of curvature in a medial-lateral plane such that each condyle has a circular-arc cross-section continuously extending from the respective medial or lateral edge of the talar component to the concave central portion. The medial-lateral radii of the condyles are smaller than corresponding radii of the condylar facets.
Saltzman, Charles L.; Burstein, Albert H.; and Deland, Jonathan T. Ankle prosthesis. US Patent 7,625,409 filed October 14, 2004 and issued December 01, 2009. https://ir.uiowa.edu/patents/493