Quantification of ankle articular cartilage topography and thickness using a high resolution stereophotography system S.A. Millington, B.M.B.S., M.R.C.S.

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Quantification of ankle articular cartilage topography and thickness using a high resolution stereophotography system S.A. Millington, B.M.B.S., M.R.C.S. (Ed.), M. Grabner, Ph.D., R. Wozelka, Mag., D.D. Anderson, Ph.D., S.R. Hurwitz, M.D., J.R. Crandall, Ph.D. Osteoarthritis and Cartilage Volume 15, Issue 2, Pages 205-211 (February 2007) DOI: 10.1016/j.joca.2006.07.008 Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 A potted tibia–fibula complex and a talus specimen are shown in this picture. The articular surface of the talus has been prepared with a fine white power to improve image contrast and optimise the performance of the ATOS system. Black and white photo targets are fixed to the flange on the potting cup. Osteoarthritis and Cartilage 2007 15, 205-211DOI: (10.1016/j.joca.2006.07.008) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Schematic of the corrective post processing procedure. (a) Different mesh extents. (b) Diverging meshes. Step 1, removal of non-corresponding regions; step 2, for each vertex on the cartilage surface the nearest neighbour on the bone surface is found; step 3, the edges of the meshes are “stitched” together. Osteoarthritis and Cartilage 2007 15, 205-211DOI: (10.1016/j.joca.2006.07.008) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Representative 3-D thickness distribution maps of the talar articular cartilage layer, viewed from the lateral (left) and medial aspects (right) of a right talus. Osteoarthritis and Cartilage 2007 15, 205-211DOI: (10.1016/j.joca.2006.07.008) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Representative 3-D thickness distribution maps of the tibial articular cartilage layer, viewed from the inferior aspect of a right tibia. Osteoarthritis and Cartilage 2007 15, 205-211DOI: (10.1016/j.joca.2006.07.008) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 A representative 3-D thickness distribution map of the fibula articular cartilage layer, viewed from the anterior aspect of a left fibula. Osteoarthritis and Cartilage 2007 15, 205-211DOI: (10.1016/j.joca.2006.07.008) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions