Should only be concerned for a very specific patient population. The stresses in the ankle are just too high for good implant survival in the vast majority of patients. That said, if someone is thin, healthy, low demand and only have arthritis in the ankle joint, it can be considered and have good results. There may be some advocates performing a larger number of these that feel comfortable expanding the indications but I don't think most people should be candidates. The technology just isn't there yet and who knows when it will get to the point when it can become more mainstream like a hip, knee or shoulder.