In previous publications I have summarized and discussed the general aspects of ankylosis and arthroplasty of the knee joint. In this report, therefore, I shall present a few features of knee arthroplasty that have stood out prominently in our experience with the procedure at the MacAusland Clinic and show how a number of cases in which we have performed arthroplasties of the knee have withstood the test of time, as to both function and stability. In our experience with knee arthroplasty, the complication of infection of the operative wound, from latent foci of infection, has been not infrequently encountered. This factor does not seem to have been stressed by other surgeons, and possibly they have not encountered it to the same extent. That the complication is not due to operative sepsis I am certain, because the infection has appeared too late after intervention. In the four cases of which I