Since the 1980s, ankle arthroplasty has been considered a dubious treatment for painful and degenerated joints. Many of the concerns that existed previously have been solved today. Prosthetic replacement of other joints also took a long time before reaching their present successful status. This is the first book to deal with ankle arthroplasty. International experts have given their opinion on (i) the kinematics of the ankle, (ii) the basics of replacing the ankle joint, and (iii) the current status of several modern ankle-prosthesis designs. A better understanding of the ankle kinematics, alignment techniques and biological stabilisation and the results of newer designs have changed the former attitude worldwide. The content of this book bears evidence for this change in opinion.