Articular Cartilage Degeneration Following the Treatment of Focal Cartilage Defects with Ceramic Metal Implants and Compared with Microfracture. - Custers, R. J. H.; Saris, D. B. F.; Dhert, W. J. A.; Verbout, A. J.; van Rijen, M. H. P.; Mastbergen, S. C.; Lafeber, F. P. J. G.; Creemers, L. B. (Journal of Bone & Joint Surgery, American Volume, 2009)