[Sled prosthesis, rotating knee and hinge prosthesis: St. Georg model and ENDO-model. Differential therapy in primary knee joint arthroplasty].

During the last 20 years the surgeons at the ENDO Klinik in Hamburg have implanted more than 7,000 cemented primary knee prostheses of their own design, formerly the St. Georg models and now the ENDO models. The sled prosthesis, rotating knee and hinge prosthesis are each stabilized to a different degree. The indication depends on the type of deformity, the disease. affecting the knee and the type of patient. As a result of our experience with the three systems they are now implanted in the ratio of 30:60:10, and we are convinced that in order to treat all problems encountered in diseased knees it is essential to have different prostheses with various degrees of stabilization.